Here in Italy normally just the priest drinks wine at Communion, even during First Communions, but in some churches wine is given to everybody taking Communion. Wine for Communion is very light, anyway, and only a very little sip is given, at 5% alcohol content it should be ~250mg of alcohol for a ~5ml sip, not enough to give even a 0.01% BAC, the minimum to give effects to the most sensitive people. It must also be said that here, before serious problems of alcoholism started becoming widespread even amongst teenagers, a little sip of sweet, light wine was rarely allowed also to minors, for example for Xmas or New Year's Eve and not considered harmful.

The Vatican gets immunity because it's a sovereign country, and so representatives of the Vatican retain diplomatic status in nations that respect that sort of thing (which is basically everyone)

However that doesn't mean all representatives of the Catholic Church have immunity, not by a long shot, but the guys at the top have as much immunity from prosecution as every foreign leader, from petty crimes to crimes against humanity

@ Sapphi Snake

I remember what i remember, which was drinking wine regularly at communion at the parish where i received first holy communion. When i switched parishes as a pre-teen, the new place didn't have it, but the wine was there before then...

It probably varies from diocese to diocese, or from parish to parish