What type of narcotics are drug dogs trained to find?

Dogs can be taught to identify the specific scent of individual types of drugs. Narcotics detection dogs can typically detect recreational and illegal substances including cocaine/crack, hashish, opium, marijuana, heroin, methamphetamine, cocaine, Xanax, and Ecstasy. As new drugs become available or popular, dogs can be taught to detect their scents as well.

If it is so taught to, but concievably without such training it may hone in on a "suspicious" scent. Point is DONT DO/DEAL DRUGS.