Biological Controls

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Air and Gas Phase Filtration for the
Evidence Room and Property Rooms


Health Concerns and Hazards in Evidence Rooms click here

   Aspergillus precautions when storing marijuana

From the web site of the

International Association for  Property Room & Evidence Room
Property Room Standards for Evidence and Property Room Technicians

Narcotics evidence should not be commingled with any other property types, except when a common enhanced security area is shared with the storage of firearms or currency. All items in this category should be handled and processed with extreme caution. The following are recommended features for a narcotics storage room:
• A narcotics storage room must be impervious to entry and should be constructed of either concrete block wall or heavy gauge fencing.
• A narcotics storage room shall have an adequate ventilation system consistent with legal mandates that will not impact other areas of the building. Always consider a Negative Pressure System.

Visit the International Association for  Property Room & Evidence Room site, click here.


Evidence Room and Property Room Biological Controls suggests and recommends the following for property rooms and evidence rooms:
MICROCON® ExC-BUV with Germicidal UV

Used by Major Hospitals and Health Care Facilities in creating Negative/Positive Pressure Isolation Rooms.
Germicidal UV lamps are available in the units to aid in compliance with all CDC guidelines. And for non-exhaust applications.

All our HEPA filter units comply with CDC Guidelines, and are FDA 510K certified. “An FDA 510K certification is mandatory for air purification systems in hospital use!” Specifically designed for removal of airborne contaminants which could and will contaminate the evidence within the evidence room and or property room.

The ACCUSTAT® was designed as a differential room pressure monitor that measures both and negative and positive pressure. It will compare the room pressure to that of the corridor and maintain an accuracy of .001 inches WG (water gauge) as identified on a large digital readout. User set alarm function warns visually and/or audibly of a room not in compliance after a one minute "false alarm" cycle has been triggered. Has locking key switch controls for on/off and negative/positive selections. Remote monitoring capabilities are available, as well as interfacing with building management systems. Two models are available, a stationary mount and a rechargeable battery operated portable.

Dry, musty, stale, dusty, stagnant, smelly, are these some of the adjectives that might describe the quality of the air in your evidence room? Is this what you’re used to breathing everyday caused by poor ventilation, inadequate air changes, or insufficient filtration?

This can all lead to damp, moldy and unhealthy conditions. What’s being stored, contained and what is off gassing and what evidence may contain hazardous pathogens that become airborne? When those pollutants are airborne they become respirable and what you breathe in has the potential to make you sick.

The same equipment we have manufactured for the hospital and medical areas are now made available for evidence rooms. Equipment that filters out particles as small as 0.3 microns, that covers the bacteria and with the addition of germicidal UV lamps we can irradiate the airborne viruses.

Air is constantly being filtered and recirculated and returned to the room so the system is independent of the heating and cooling system. Which results in No Loss of warmer air from heating or cool from your air conditioning. Saving Energy and compliant to the recommendations of the International Property and Evidence Room Association.

Ceiling mounted means its out of the way and produces a very even and consistent air pattern that eliminates stagnant air pockets, static air layers and provides for continuous air movement with high efficiency filtration.

Carbon cells eliminate gas phase pollutants and remove odors and fumes from the air. There’s an air purifier for make for virtually every contamination need and application. Let us know your problem so we can provide a solution, since 1973 we’ve been doing it and we’ll provide you with plenty of evidence.

In many cases the Defendants' Attorney uses inadequate and improper management of Evidence Room and Property Rooms as evident reasons in establishing impermissible and contaminated Evidence.

The MICROCON® ExC-BUV or the MICROCON® CD will alleviate your dilemmas
within the Evidence Rooms and Property Rooms.

The Evidence Room and Property Rooms are not to have any windows as a result, air purification and a Negative Pressure Room is extremely important, especially in narcotic storage areas. A ventilation exhaust fan that runs continuously is not the most effective way of handling this. The biggest dilemma is the Indoor Air Quality. Allowing outside air pollution and noxious odors into the evidence room and property room.

Narcotics fumes should not be circulated within a common ventilation system. The MICROCON® recirculates HEPA Filtered clean air at very good air changes per hour depending on room size.

Ventilation systems can bring some very serious contaminants. Air pollution is rampant. Carbon monoxide fumes, diesel exhaust. The EPA has over 60% of all cities in the US on diesel exhaust alert. Dust, pollen and air particulate can contaminate and destroy pertinent evidence. Outside ventilation for the evidence room and property room is also exposed to climate dilemmas and air temperature changes. Dampness and moisture will cause metal to rust. It can also affect and contaminate many other pieces of evidence. Photos and electronic digital CDs, VHS Video tapes will become contaminated. Dust is another troublesome particulate in the evidence rooms. This air purification is also protecting the staff of the evidence room from all this air pollution which will make them ill and possible infection of contagious diseases. And the poor air quality and odors are nauseating.

Speaking of biological evidence, what do you do with items that have fresh blood, for example, which has to be dried before packaging and storage? Some type of drying area is required. It must be able to contain any dripping liquids in a safe manner, have good ventilation, be able to preserve the integrity of the evidence, and it must protect employees from accidental contact. 

The best solution is to have a separate room set aside for this purpose. There are also commercial dryers available for this purpose, but they can be expensive. M ICROCON® Air Cleaners create a clean, safe environment by clearing particulate, infectious air, and VOCs (volatile organic compounds) from the air. Dirt, dust, soot, mold spores, bacteria, dust mites animal dander. MICROCON® eliminates infectious airborne pathogens, removes hazardous microbial airborne particulate. Potential hazardous bacteria introduced into the air by infected persons from whom this evidence was retrieved. They are invisible to the naked eye and can remain suspended in the air stream indefinitely. MICROCON® with HEPA Filtration captures this particulate as small as .03 microns in size.

If you are utilizing ventilation systems for other areas be sure these areas are concealed to the negative pressure room. MICROCON® MCDHUV is used in highly sensitive environments, such as to avert migration of airborne particulate from seized drugs that could become contaminated and unusable evidence. It protects employees from contaminants such as blood-borne pathogens from all forms of evidence (clothing, jewelry), lead dust from weapon storage, and drug off-gassing.

The MICROCON® MCDHUV Air Purification System meets requirements for law enforcement
organizations, US government agencies. And any of a genus (Aspergillus) of ascomycetous fungi with branched radiate sporophores including many common molds.

Photos of Evidence Room

Photo of Property Room

Picture of Evidence Room

Time demands of the Property Room and Evidence Room
For purposes of this report, police evidence rooms are storage rooms with the systems for securing and retrieving evidence. They are under the control of police departments, public safety departments, the Office of the County District Attorney (DA), and the County Office of the Sheriff. Police evidence rooms contain evidence; property held for safekeeping; such as guns confiscated in domestic violence incidents and money or property from accidents; and lost property found within the local jurisdiction.

The most critical property stored is evidence collected during the course of an investigation into a crime. Evidence plays a vital role in the investigation, prosecution, and conviction of persons who have been accused of criminal acts. Maintaining a proper, well-documented chain of custody and ensuring the integrity of evidence are crucial to successful law enforcement, prosecution, and court operations. Examples of evidence range from DNA and biological evidence that must be specially stored at constant temperatures. Which is virtually impossible with ventilation systems.

Less than 1% of evidence collected is used in trials. Most evidence related to crimes and investigations is returned to owners or destroyed when cases are resolved.

In the case of property crimes, the physical evidence is processed for fingerprints and photographed; its serial number is recorded and then released to its owner.

Legislation requires criminal justice agencies to maintain certain evidence for extended periods of time, sometimes forever. For example, the law mandates that all death penalty case evidence be held indefinitely. Evidence from certain homicides, sexual assaults, and serious felonies are secured for a long time. Domestic violence tapes are stored for ten years. Often, the evidence must be kept for the lifetime of a convicted criminal and even beyond, if other individuals could, at some time, be tried or exonerated for the crime. In those property crime cases where no suspect has been identified, evidence is kept for a period prescribed by law for the specific crime. The security of property stored for safekeeping and found property is equally important as a matter of public trust, even though this property does not enter the judicial system. Much of the found property may be auctioned if the owners cannot be found or do not wish to claim it. Every police agency receives evidence collected at a crime scene and throughout the entire investigation period. Police headquarters have packaging stations for the proper handling and storage of evidence. Packaging has the dual purpose of inhibiting contamination as well as preventing deterioration or destruction. Packaging also assists in efficient warehousing and retrieval. A locker system secures evidence until the evidence technician processes the material for storage or it is picked up for transport to the County Crime Laboratory for analysis. When major crimes occur, the police agency crime scene investigation unit reports to the scene to ensure that all evidence is properly packaged and labeled. Clothing may need to be dried, paperwork completed, and other evidence examined prior to being forwarded to the evidence room.

Usually the evidence and property storage function within each police agency is assigned to one or more technicians who are not sworn police officers. Some agencies combine evidence room activities with the other duties of a sworn officer. In both cases, evidence room personnel work closely with detectives as they investigate crimes and work towards convictions in concert with the DA.



Environmental Protection Agency


American Lung Association


American Academy of Allergy Asthma & Immunology


Allergy & Asthma Network Mothers of Asthmatics


US Department of Labor


National Safety Council
Environmental Health Center


American Society of Heating, Refrigerating and Air-Conditioning Engineers, Inc.


Air Conditioning Contractors of America


Air Conditioning & Refrigeration Institute


National Air Duct Cleaners Association


National Air Filtration Association


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