I read your entire thread, but let's take your position seriatim.

1. Do not argue law at the police station.

You claim that lawyers should be eager to point out issues of procedural irrégularités at the police station.

My question to you is, who is the proper person that is legally vested with powers to determine whether a procedure adopted by the police is right or wrong? Is that person found at the Police Station?

Follow up question, can a challenge on procedural irregularities at the police station be entertained only at the time of occurrence?