part of the problem is that dhl is owned/got bought out by airborne.
i can't say about anywhere else but the airborne near where i live has some serious problems. i don't know if they still do this, but the last i heard they still were. a few years ago they didn't have enough employees to work for them (people quitting/nobody applying for jobs) so they took busses to some of the cities nearby and pick up homeless people, drug addicts, pretty much anyone who would be willing to work for a few hours. they would pay them cash at the end of the night and drive them back. my friend was working there when this was going on. a couple of the things he told me was he had one of the bussed in people ask him if he knew where he could buy some crack. and that one of the people was chasing another person around with a gun threatening to kill him.
i used to work at airborne for about 2 months, but it sucked so bad i just quit showing up. then at tax time they never sent me whatever form it is that shows how much you made for the year. after calling a half dozen times and being told "we'll send it right out." i had to drive there and make them give me a copy. it was only a 20 minute drive, but the point is they were supposed to send it to me. (without having to call them at all) and because of that i got in trouble for paying taxes late.