When the drug warriors aren't helping create a black market in illegal drugs, wasting tax money, diverting police resources from real criminals, or sending innocent people to prison in large numbers, they can occasionally be found killing innocent bystanders.
Who's an innocent bystander, you ask? Baptist missionaries in Peru mistaken for drug runners. Ismael Mena, a Denver resident at home one day when police mistakenly raided his house - they had the wrong address. Or these people here, and even more here. Total casualties listed at the links above :
16 Dead, four wounded. I didn't count the ones where the victims had some drugs, just the ones clearly uninvolved with the drug trade.