Mariner, perhaps it wasn't very clear but my point was I don't think they are very often packed properly. If shipped according to the regulation it minimises the risk but yes, it is still there (UPS6 anyone?)
Problem is all the joe publics out there who haven't a clue and then worse the freight forwarders who couldn't give a toss and just throw it on without honest documentation. I've worked with freight enough to know that there are a huge amount of either deliberately misleading descriptions or ignorance as to what constitutes a DG by air... Commercial freight is one thing but regular mail going on pax aircraft is a can of worms I hate to think about...