Re-route the baggage from the tier 3 manual scanner back round to the start of the scanners and ensure your security staff are fully trained. This should stop dangerous bags from being loaded onto aircraft. See original post here:
Never seen dangerous baggage loaded to aircraft. Some bags go around few times and gets rejected by various tier 2 scanners and eventually either get cleared or destroyed. Most of the bags rejected first actually end up being passed and loaded into aircraft. Either there is a big bug in the scanning AI or there is a mechanism of false positives, but this seems to work. And there isn’t too many incorrectly destroyed bags either.
In the Beta 1 released thread post 360 & 375 from @Pasi