Bart, I don't mean to be antagonistic. I'm very curious, though, why something that looks like it might indicate possession of a controlled substance holds so much more weight than other things that look like they might indicate other types of wrongdoing, so I provide these other examples to make people think about how many "possibly suspicious" things a TSA agent is likely to see while searching us. Most people don't think that the other examples warrant holding someone's belongings while law enforcement is summoned, but because of American "drug war" craze (which thankfully, may be winding down now that Gil Kerlikowske is director of ONDCP), they think it's appropriate to do so when something that looks like it might be a controlled substance is found while searching for dangerous items.