“Old school” training taught us to check the stopped vehicle’s trunk upon the approach to contact the driver. There were two reasons for this; first to make sure it wasn’t slightly ajar as if someone was hidden inside & waiting to ambush us. The other was to “fingerprint” the vehicle with our own prints. From what I have heard, this is still being taught to this day in various law enforcement academies & I believe it’s distracting to the officer.
Older cars did not have “trunk” releases like cars nowadays that can be opened with a remote control, a button inside of the vehicle or from a safety lever from inside of the trunk. Before, if someone were inside, they’d have to hold the trunk slightly open to get out or someone with a trunk key would have to get out of the car & manually open it. The reality of a trunk ambush is very rare & always has been. So why are we taking our attention off of the “known” occupants of the vehicle to check an obviously closed trunk to guard against a rare amubush or, even more senseless, solve our own murder!?