comment: >
  
  I'd accept this in a heartbeat. Pretty good as a wish list. I would imagine it would allow for a lot more welcome room for reasonable discretion perhaps.
context: Just a side note: I had a job as a medic mostly on construction sites and it involved both pre-employment and post-injury drug tests. It’s not just a weed test. Meth, and especially coke, are also very common to find, and I’d say I found non-negative results for coke maybe 60% as often as I would find them for weed (in a recreational legal state). The reason is obvious in that construction workers know they’re likely to get tested at unpredictable intervals due to injuries, so more choose things like coke that are out of their systems fast. >
  
  No one seems to be pointing out that we are testing for THC-COOH a metabolite of weed that happens to be fat Soluble and why it stays in the human body for so low. No other drug on the 5 or 10 panel is tested this way. You can do a blood test for Delta 9 THC but it's not detectable within 48 hours. >
  
  If there was a test that existed that could identify whether you were still under the influence of weed as opposed to just having some in your system, would you be opposed to that test being run? >
  
  In this very hypothetical hypothetical, are all drugs being treated the same (or at least are the users of least intoxicating not being disproportionately punished? Is each drug detectable for the same length of time? >
  
  That's not really relevant to my point. I am asking if such a perfect test existed, would OP be averse to being tested for marijuana before being allowed to work, regardless of any other drugs test. i.e. is the issue that they are testing for marijuana in the first place, or is the issue that the testing being used is an imperfect indicator for inebriation? >
  
  I didn't mean to sound dismissive of your question. I just didn't think giving an answer one way or another would change the conversation.
  So let me answer your question: no, each drug acts as it does in reality. And no, punishment is not the same: If you have traces of legal drugs but are "under the imit" there is no punishment. If you are found to be "over the limit" on a legal substance, you get fired or sent home until you are sober. If you are found to have an illegal substance you get fired and reported to the cops.