This boilerplate phrase shows up in search warrants and other law enforcement paperwork something used a preemptive defense for whatever rights violations might occur subsequent to these sworn statements. Using training and expertise as the foundation for a defense against lawsuits and accusations of bias is handy: it shows the officer was being reasonable and only engaged in a roadside fishing expedition or hurled a flashbang grenade into a toddler s crib because all of this training led officers to believe criminals often engage in [Action X], thus justifying law enforcement [Action Y].
But this blanket assertion is as useless and full of shit as this Tenth Circuit Appeals Court decision granting qualified immunity to officers who detained someone for recording them while they assaulted an arrestee. (h/t Brad Heath)