No doubt the canapes and the wine/cheese stuff they smeared on Ritz crackers.
Not enough to bring someone not drinking to a reading of .05.
As someone who uses a alcohol in a lot of her cooking, and makes a lot of canapes/appetizers I do not see it happening -— unless you only consume gin soaked raisins :)
The reading even disconcerted the person who administered the test to me -— an off duty state trooper.