You're talking about stuff you REALLY have no concept of. Drug tests can't tell whether a person is 'stoned' anymore than a lie detector can tell whether a person is lying. What it gives is a reading of THC levels at best. However, the presence of these levels doesn't mean that a person is stoned. Tolerance is what determines whether a person is 'stoned' or not. For example, a person can show 30ng/ml on a test and be perfectly functional even though they're supposedly 'stoned'. A different person with the same low amounts of THC can be sitting on a floor vegetating because they simply have no tolerance to marijuana in general. Again, the presence of these chemicals DOES NOT necessarily imply being high. That's absurd.You're wrong. Work tests do not show degree, they don't have to because ANY use is disallowed. However, the blood tests given by police can determine the amount of active THC. Yes, we can tell if you're currently stoned medically.
What? Of course there is. You made a claim about the suspect being usually a drug dealer. I want to know what you base this on.Since you were speaking in general terms, without a specific instance, no evidence is going to be available either way.