Throughout the United States agencies use various standards for storing narcotics. The Department of Justice and the court system have expressed concern over possible contamination of individuals while storing or handling packaged narcotics evidence. 

Sealed Evidence: Items should be submitted in sealed evidence containers. Breaking the seal and opening an item could endanger a case in progress. Normally, the seal should not be broken by the property unlit unless directed by the chief or supervisor to do so. Reasons might be during an audit, suspicion of mispackaged or leaking evidence that  could lead to endangering the storage facility personnel, etc. Opening of sealed evidence is only done with a witness present, preferably a supervisor. If in doubt contact a supervisor for information on your agency's policy on opening or repackaging of evidence. 

Use a minimum standard sized evidence envelope for packaging: Determine an appropriate size container, for example a preprinted 6"x 9" evidence envelope. All items of evidence must be submitted in the sealed and signed preprinted 6" x 9" envelope lUl1ess they are too large to fit. A minimum size prevents loss due to irregular size packaging and creates a professional look in court. 

Narcotics sealed in 4 mil thick polyethylene bags keep the narcotics in and prevent packaging penetration. There are numerous providers of 4 mil thick barrier proof scotch pak bags (name brands include: Milvan Barrier C, Kapak, Lynn Peavey Evidence Pouch, etc.). 

To insure the safety of property and evidence professionals it is recommended that the following standards be followed: 

Narcotics, non-liquid, except marijuana: Heat or electric pulse sealed in the appropriate size 4 mil thick bag. This includes cocaine, cocaine derivatives, PCP, methamphetamine, heroin, etc. Heat or pulse seal ensure complete closure. 

Narcotics, liquid: Place in barrier proof vial then seal into 4 mil thick scotch pak type bag. It is recommended that the sealed item be placed into a second bag and sealed again to avoid any possibility of a small hole or improper seal releasing the liquid. Extreme care should be used with liquids, such as PCP, LSD, etc. Liquids can be absorbed through the skin on contact. 

Marijuana is a natural vegetation and, while illegal contraband, is not considered in the same storage classifications as narcotics. Marijuana should not be sealed in plastic because it will turn to a toxic liquid substance. 

Bulk marijuana must be properly dried. Shredding or stuffing marijuana into a box can create "compost type conditions". Compost piles generate heat and require proper care to avoid fire. Several property sections in the U. S. have experienced self ignition fires when marijuana has been stored improperly.