Quote Originally Posted by Gamadius
I mean even if the human eye couldn't detect it synthetic, there would have to be chemical tests for sure to tell.
Ding Ding Ding, we have a winner. Not only can they not tell by sight, smell and sight are obviously subjective and must be confirmed with the validity testing, pH, specific gravity, and creatinine clearance unless you hand them a cup of black urine or smells of gasoline.