Deletion of Contagious shooting (2nd nomination)

Comment: term that is used and discussed in |many criminal justice textbooks and police training manuals. In fact, I used to teach about it
Stance: keep
Cited policy: Wikipedia:Articles for deletion (WP:BEFORE)

Comment: and trim a bit (in particular the lead). The word is around in newspapers, and there is a reasonable section with examples, which disprove respectively  and  claims
Stance: keep
Cited policy: Wikipedia:No original research (WP:OR||WP:DICDEF)