about a phony New Jersey driver's license he offers up bearing the name Mark Rosario.

 You're under official police investigation right now,  one officer warns.  You give a false name to us again, you're gonna be arrested for false ID. 

When Mangione finally comes clean, they ask why he had lied.

 I clearly shouldn't have,  he responds as he's asked to write his real name and spell it aloud.

Other videos show officers patting Mangione down, reading him his rights, placing him in cuffs and taking him to the police station.

As an officer searches him more thoroughly at the station, another officer goes through his backpack.

The officer finds the 9 mm handgun authorities would later confirm was used in the killing, as well as a silencer and another ammo magazine. They also recover the journal that prosecutors would later say revealed Mangione's intent to  wack  a health insurance executive, as well as his other handwritten notes.

 He has a checklist for today,  another officer says, ticking off the seized items to someone on the phone.  Tomorrow he's supposed to do an intel check-in and get a survival kit.