It comes after a huge haul of trafficked weight loss drugs was found in Northampton last year.
A panel finds a former detective constable would have been dismissed had he not already resigned.
Police are appealing for witnesses and information about the crash.
Northamptonshire Police appeals for people who witnessed the incident to come forward.
Police say a cordon is in place at the site on an industrial estate.
Radd Seiger says he will continue to help society's most vulnerable people stand up to authority.
James Hoare says coming to the police's aid on two occasions was a "nice way to help the community".
The victim was stabbed in the cheek with a knife and required hospital treatment, the force says.
Police will check images live against a list of people who are wanted or considered a risk.
