Why not touch the potential evidence? They've just hit an operating clandestine drug lab, a 'clan lab' in which case it is not safe to turn off any heating elements or disturb any chemical processes in any way until an expert takes over the situation. Chemicals can be explosive or even create deadly gases if handled incorrectly.
With the building secured, some of the agents change into white "bunny suits" which act as protection against chemical burns and contamination. Breathing apparatus may be required depending upon the air quality inside the rooms containing the clan lab. With the advancement of technology, agents can use "sniffing machines" to test the air before dismantling the lab setup. Now, the bunny suit team (sorry, no rabbit ears or cute bunny tail on these suits) along with a qualified chemist can enter the rooms and take photos and videos of the operation. The chemist and lead agent decide what equipment is collected and which chemicals are sampled as evidence. The rest is usually packed into 55 gallon metal drums to be destroyed rather than kept in an evidence locker until trial. After leaving the clan lab, the agents are showered down in a kid's portable swimming pool and their bunny suits are destroyed.
|One source for recipes|
First off, there's the chemist, who knows what he's doing, and then there's the majority, who are merely "recipe readers." A recipe reader is a person who has learned all the necessary steps from a person in the know and can follow a chemical recipe, but does not truly understand how chemicals and chemistry work. This is the guy who decided a plastic bucket will work in some of the steps because he can't acquire lab grade equipment without attracting suspicion. This is the guy who when he runs out of a needed chemical will decide that a similar sounding chemical name will suffice. This is the guy who uses his own product, becomes over paranoid at strange sounds and discharges his firearm out the window whether anything is out there or not, or lights up a cigarette while washing the product with ether during a final step, or forgets he booby-trapped his lab against potential outsiders.
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And of course, there is always the occasional explosion from improperly mixed chemicals, combining the wrong chemicals, or a spark from an electrical fan not lab grade equipment, not to mention that forgetful cigarette smoker who just has to inhale from one more coffin nail.
Since there is no quality control in these clan lab operations or afterwards, that means the buyer of these substances does not really know what he's getting and ingesting into his body. For instance, a meth lab in Washington had a faulty process which left lead in their finished product. Some customers subsequently expired from lead poisoning. Drugs are also diluted with various cutting agents such as baby laxative, milk sugar and arsenic to make them go further. Seems the arsenic helps provide a kick to some products, but since there is no quality control, who knows what percentage of the product is now arsenic? Of course, that may come out in a coroner's report, too late for the initial consumer.
Even with all this, the lure of large sums of money keeps seducing people into setting up clandestine laboratories. Guess they think nothing will happen to them personally. As for the street user, he's already addicted to the drug of his choice and is willing to take the chance on what he's buying. Helluvaway to live. Or to die.