Hallucinogens are a step above the typical low-key drugs found on the jobsite. Hallucinogens severely impair cognitive function and sensory perception. Visual and motor skills become distorted, skewed, and warped, not to mention the completely fabricated hallucinations which can arise at any moment, due to the psychological effects of the drugs. Typically, hardcore abuse of hallucinogens is pretty detectable at work, since the individual simply is unable to function like a normal adult in everyday life. However, you might be wondering where this problem arises in the first place and how it can be effectively eliminated.
First, you should know that hallucinogens are somewhat misnamed. Hallucinations are actually completely fictional and they are perceived as reality. The individual cannot determine the difference between reality and the altered perception of reality. Hallucinations are caused by deliriants, which include atropine and diphenhydramine hydrochloride (DPH, or DHM). Hallucinogens alter reality in a distorted, psychedelic manner, which is obvious to the individual experiencing these illusions. Hallucinogen abuse is easy to pick out in the workplace, because it is extremely difficult for the employee to not exhibit abnormal behavior. Deliriants may be much more difficult to observe, since the individual may not be aware that reality has changed and they may still exhibit normal behavior and be able to perform most functions of work without detecting their illusion. 
Hallucinogens fall under the category of psychedelics and dissociatives. Psychedelics, such as LSD and PCP, alter reality or familiar memories and associations. Dissociatives, like Ketamine and Methorphan, can also alter perceptions, but they bring on a dissociative state as well, and usually act as depressants. Employees who are acting depressed or drunk may not be intoxicated with alcohol, but on a type of dissociative drug. You do not need to be an expert in order to identify abnormal behavior. If you are in a managerial position, you have learned to watch for the signs of individual personal problems in your staff. It is in the best interest of your company to make sure that these personal problems do not become public incidents. You have a professional, solid image to uphold. 
CMM Technology offers high quality drug and alcohol testing equipment and we can refer you to a reliable onsite testing service, so that you do not have to schedule responsible corporate protocol around your business. Convenience and trustworthiness will streamline your efforts to create a safe, creative working environment. Contact CMM Technology today: +618-9204-2500.
1. Glennon RA. Classical drugs: an introductory overview. In Lin GC and Glennon RA (eds). Hallucinogens: an update. National Institute on Drug Abuse: Rockville, MD, 1994.