Yes, I believe it stems from the tankards having lids back in the day, which is due to the belief that plague-ridden flies could fly into your beer, and also against "night air". Interestingly some Germans still believe "moving air" (well, draft) is unhealthy, especially from an AC, and the cold air is what makes you sick.
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All over Germany, and it's been around much much longer than the fear of having something slipped in your drink.
To be fair, in the summer you need to make sure the wasps don’t slip themselves into your drink.
Yes, I believe it stems from the tankards having lids back in the day, which is due to the belief that plague-ridden flies could fly into your beer, and also against "night air". Interestingly some Germans still believe "moving air" (well, draft) is unhealthy, especially from an AC, and the cold air is what makes you sick.
https://en.wikipedia.org/wiki/Miasma_theory