If you have been through a drive through, or ordered a takeaway drink, the attendant at the window would have given you a straw. Generally they pick these straws up by hand, could these be contaminated. Can drinking straws make you sick?
Anything you get from a takeaway could be contaminated (the food, the napkins, the bags they put it in, the money they hand you...). I wouldn't fixate on the straws in particular. Either you trust that fast food workers wash their hands before handling food and stuff like they're supposed to or it might be better not to eat from those places.