<p>One of the challenges of comparing pot to alcohol is that when you test someone via a breathalizer for alcohol you can immediately determine an apparent degree of intoxication. Alcohol is processed by the liver at a rate of approximately 1 ounce per hour. You can drink quite heavily and a day later test negative. Pot stays in the system much longer as it’s properties are fat soluable typically up to a week for occasional usage and possibly a month for a chronic user. Woman tend to keep it in their system longer than men as they have a higher proportion of body fat than men. What this means is that while two people could both test positive for pot one could have smoked it a few days ago and have no intoxicating affects and another could be quite high having smoked within a few hours. There are tests to determine levels in the blood stream but I don’t believe they predict intoxication.</p>