One nearest and dearest to me was a city cop in a college town for several years. Sometimes girls would come to the police saying they went to a party, got so drunk they passed out (or at least don’t remember anything about the party), and woke up with no underwear. They were crying that they were raped, but didn’t know who, when, exactly where, or even how many. The cops had nothing to investigate.
Now I am not blaming the victim, because in an ideal world, nobody would take advantage of an incapacitated person. However, this is not an ideal world. If one is going to a party with a bunch of strangers, it is best not to get falling down drunk.