Isn't entrapment by trying to get clerks or waitresses to sell alcohol to a minor illegal?:
First, my expertise.  I'm a lawyer and I used to work for a firm that did liquor license litigation.

It's not entrapment for law enforcement to send minor decoys into a liquor store to see if the clerk will sell them alcohol.  It would only be entrapment if the minor decoy used extraordinary means to convince the clerk to sell alcohol to him.  The test is, was the clerk predisposed to commit the crime of selling alcohol to minors.  If the decoy just says to the clerk, "Oh, come on!" and the clerk gives in, the clerk was already predisposed to commit the crime and it's not entrapment.