Mr. Archer......

It is quite obvious to me that you have never lived with an investigator before. My wife deals with violent felons (murderers, rapists, violent sexual predators, etc)  on a daily basis. She is trained on various things such as "catch" questions, which she will switch up her interrogation techniques to throw you off guard....to body language, meaning she can tell if you are lying by how you eyes shift, sweats, hand movement, facial muscles,  etc. And within the confines of her house, where I am allowed to reside, the rule of law is thrown out. She can make the Spanish inquisitors look like pikers.

So.....amateur? Perhaps.

But come walk a mile in my shoes before you pass judgment.