I would love to do what you do OP. I am weljel.
I knew an ex police dog and handler when I worked in a pub. The pub owners had adopted her after he had retired from the police and took the pub on and she finished with him. They used to leave her with me when they went up to bed. She was absolutely amazing.
He had taught her (and me) to check the cellars, take the till down to the safe and if I dropped the hatch at the end of the bar she sat by it and no one was coming through it.
She would also escort me to my car when I had done, then jump over the back wall of the bungalow where the owners lived to go to bed. He taught me various words/phrases and how to say them if the shit ever hit the fan. I remember she would always ignore 'come here' or 'leave them' and I had to say something else to call her off.
Does every trainer have different commands for stuff like that? Or had he taught her that specifically for her 'second' job?
She was amazing. There was a fight one night in the bar and she stood at the end.of the bar barking and growling under the serving hatch but never moved away from it until someone fell against it, then I thought she was going to launch herself over it.
Another night walking me to my car she found a couple having a romantic snog in the carpark and stopped dead and wouldnt stop barking until they went.
And apparently before I started working there she stopped the landlord from being attacked by idiots who were asked to leave. He apparently had a quiet word and told them to drink up and go. They said to make them and started squaring up to him, he asked again and there was a bit of a push and next thing knobhead bloke on his back with a very loud dog barking in his face.
Adopting a retired police dog is on my bucket list of things to do. I adore GSDs but never had the time to devote to one but one day I will.