Depends on where he was hit. A .22 can take you out with one round if you are hit in the right spot. .22s and .380 kill more than any other round. This is from FBI stats. These two rounds have a low recoil so you can get proper shot placement.
The tragedy of this is that it makes it very difficult for policemen and women who are good and fair at what they do to do their jobs well, because people suspect them, too. People tend to broad brush. Cops have very difficult, demanding jobs (and they face the worst of society five days a week (at the least), eight hours a day. The good ones (I’d say most of them are good ones) are being villified along with the bad ones.