The simple answer is that they don’t exist.
Lets face it, you go for a warrant, it is their best interest to fail you on something because that way they get more business.
Of course you should go to a independant Vehicle Testing Station for warrants.
I’m an AA member so I’d like to think I can trust a company I partly own (because I’m a member), but at the end of the day, there lies the same incentive.
There’s just no getting around it…