As far I am aware, there is no law enforcement officials who is too busy to take someone to a local precint to be FP and a mug shot taken, it is what they are trained to do to ensure criminals are put behind bars.
Again you just assume anything you have not heard of is untrue. Citations are given all the time without taking the offenders to police stattion. This
oif course won't happen to serious crime but there are a huge area between serious crime and petty offenses. For petty offenses, it is quiet normal
for police to just issue citation.summon after identification is established on the spot.