Both drug labs and homemade explosive labs use a variety of highly hazardous material, present significant danger should one interrupt a process, and yield deadly products.
Explosive compounds are also easily mistaken for drugs. Peroxide explosives generally will be a white powder or crystalline material, very similar to cocaine, heroin, or many other drugs. Note: Never use an acid-based drug field test kit on peroxide explosives. If you do, the sample will violently detonate.
As a patrol officer, your best course of action is to secure any lab and refer entry to trained and equipped specialists. However, circumstances dictate procedures and a tactical situation may require taking action. If so, quickly secure offenders and victims and retreat to safety. Do not interfere with processes, turn on or off any electrical devices, or stop to collect any evidence; leave these things for a trained specialist.
If you enter a clandestine lab, you are exposed, and must be considered contaminated. Expect to be quarantined until hazardous materials specialists arrive. When the hazmat guys do arrive, you will be washed down, stripped of everything you entered with, and possibly be sent for medical evaluation. It is not just for your health-it's for the health of anyone you may encounter until fully decontaminated, including fellow officers, citizens, and family.
Bomb and explosive incidents have consistently, if slowly, grown in numbers. Whether initiated by terrorists, criminals, juveniles, or emotionally disturbed individuals, bombings may occur in any jurisdiction. Police will often be on the leading edge encountering devices and their makers. If you recognize the potential of bombs and maintain situational awareness, your safety, as well as that of the public you serve, is greatly enhanced.