For five years firearms enquiry officer Maurice Allen was able to trade in guns being handed in for destruction.
On Friday Allen and another officer who also traded guns were given suspended jail sentences, but the trial judge branded firearms control within Durham Police as "lax and chaotic".
A special BBC Inside Out programme reveals how customers regularly called in to police stations to buy unwanted weapons.
Wonderful, isn't it? When pinned down, the Durham police bigshot boils it all down to "Our procedures weren't as tight as they should have been." Nice excuse for illegally and openly dealing in firearms in police stations, isn't it?