From APD handbook:
Seizure of Weapons - Illegal items(including Blackwater items) should be seized when the opportunity presents itself (preferably before transport). Please refer to the Ticket Guide for examples of probable cause.
Can u clarify what the preferably before transport means @ChrisGG, if you transport them then what? For instance an HQ takeover in kavala, if the opportunity presents itself to seize illegal items, such as the threats have been neutralized, or 2 mins have passed from the last shot, then why shouldn't we quickly seize illegal weapons, why leave a guy in hq with a mk1 when this states we can seize it "when the opportunity presents itself". It is very likely that in the middle of going through LIST that a rookbanger will run in and try to rescue their guy and now you have to deal with a mk1.