Hand check access to Rico's jail at Aspen penal colony.
Fingerprint protected device for Rico in jail.
Judges have Lawgiver Two as gun, which is "on board protected, DNA code keyed", reading the skin.
So a non-judge cannot use it.
Moreover, each bullet of the Lawgiver Two gets a ring with the DNA code.
So Judge Dredd is convinced of murder, as he has the same DNA as his genetic twin Rico.
Judge Archer tries to identify Rico using facial recognition.
Fingerprint protected access to the Janus program.