Originally Posted by potter

Being high is not illegal in the U.S. You can walk up to any police officer and say your stoned out fo your mind because you just smoked five joints.

Though if your in a battle for your childs custody, I could see a positive piss test being a contributing factor to you loosing your child.

Either way though, unless you are on a court order which you cannot use drugs of any kind and must take drug tests. You cannot be summoned to take one. It's against your 4th amendment right. Police cannot just go up to someone and force them to take a piss test without cause.