Earlier quoted context omitted.
This kind of dynamic exists in a few professions. About a year ago I was locked out of my house and had to call an emergency locksmith - the cost was around $150. He turned up and inserted a piece of rigid plastic into the gap between door and frame, opening the lock. The process took 5 seconds, and I immediately realized that, given the knowledge that this would work, I could have opened the door myself using a cred…
Locksmiths are sort of a weird case: you can learn to open 95%+ of commercially relevant locks with $100 of tools and less than an hour of training. The biggest reason it costs $150 and not $25 is that your locality makes it illegal to advertise as a locksmith, and illegal to possess locksmithing tools, without certification. There's a nebulous security rationale for this, because apparently normal people can be allo…
From that perspective, the ban makes sense, kind of. If the police catch a burglar with locksmithing tools, then he's automatically a criminal, even if they can't prove he broke into anybody's houses. What if he's not a burglar? Well, law-abiding citizens by definition wouldn't have those tools, unless they have the appropriate certification, which the police can of course check.
It serves as a convenient filter to lower the bar to being able to arrest burglars. Of course, there's the question of whether there are legitimate reasons for non-certified people to have these tools, and whether the tradeoff is worth it (I'd certainly lean toward "no" there, since it seems like a big restriction of freedom for a minor gain), but on its face the prohibition is not completely absurd.