Yes, and that can really come back to haunt the entire department when those statements are later impeached. Sometimes a civil suit results.GREAT question! I've been saying that for years. Question: are not the officers official incident reports a sworn statement?
Sometimes, like in some of the OC arrests we read about, the LEO just doesn't know the law and makes the arrest. Charges get dropped but the poor guy carries the arrest on his record even after he's cleared. Anyone can make a mstake and penal laws are pretty convoluted in some states.