Nepotism doesn’t require that you be unqualified, just that their be a more qualified applicant / candidate who was passed over because of your connections. So unless his son was the best applicant / candidate for the job it’s nepotism.
Every single cop who turned a blind eye to his behaviour should be charged as an accessory… if fact that should be the standard for dealing with police (i.e. any cop who sees another cop break the law and does not take action is treated as an accessory in the eyes of the law)
Shall I continue?