Kurtis Blow...Dude You been smoking weed long enough not to do THIS!!

Legendary rapper Kurtis Blow was busted at LAX yesterday morning after a TSA body scanner detected a stash of weed in his pocket. Law enforcement told TMZ that body scans detected "an anomaly" in his pants -- which led them to discover the pot in a subsequent pat down.

Since it was under an ounce, he received a ticket -- and was on his way.