Why should my life be put at risk because someone came into work high or drunk? Most drugs stay in the system for a few days at least.
You have also got to ask yourself depending on where you work, would you put your life in the hands of a drug user? I know I wouldn't want to work next to anyone that did anything like that.
Voice of the masses there, thanks for the input. Subjectively, I think you come off as hysterical and easily influenced by tabloid horror stories. You're making wild, unfounded claims linking drugs being in a person's system to a person's state of mind being altered by drugs, and you're basing it all on a pathetically misinformed opinion that illegal drugs are vehemently deadly and corrupting.
I'm sure you have no problem working next to someone who enjoys a drink on a Friday night, yet if they'd rather have a spliff, suddenly your life is in danger? Obviously after the initial, desirable effects of drugs have worn off there's a longer period of instability, the come-down or a more general fuzziness of thought, but why you think this effect is so much more severe than alcohol, I have no idea.
This, of course, is glossing over the wealth of prescription drugs people take on a routine basis - analgesics including opiates, antidepressants, antacids, antiemetics - all of which have rather severe effects on your mental state, some designed specificqally to do so, and all of which pale in comparison to the hormonal tides in a woman's body during her menstrual cycle and even in men's bodies if they spend a good portion of their time in the company of women.
Again, all subjective here, but your asinine acceptance of whatever you have been told is right or wrong makes you look a fool to anyone with a remotely open-ended approach to subjects about which they are ignorant.