Can a drug dog smell snuff?

if by magic mushroom you mean schrooms then yes of course they, but the drug dog after so long of sniffing out drugs his nose will stop working. the dog has to know what he is smelling before it can sniff any drug, so is owner (police OFFICER) takes WHATEVER DRUG SAMPLE AND HAS THE DOG SNIFF THAT PICTICULAR ONE, AND THEN SENDS THE DOG TO SNIFF IT OUT.