I have raced at enough tracks that this information is really more dependent on where the tracks are located and what the ownership determines. Some tracks tech you in when you hand them the money for the entry, other tracks have a once or twice a year tech inspection and others will tech you every time you show up to race. Bottomline is that your safety is not the tracks or the tech inspectors responsibility - it is YOUR responsibility. I have seen it seems like just about everything at one time or another, I have lost racing friends to accidents that you can't come up with answer too. And don't get me wrong I get irritated at changing seat belts that are damn near brand new and buying new helmets every 5 years but I worry about my safety. And I think other racers should worry about theirs. And when a tech inspector points out something that needs correction - thank them and take care of it. Sure, you might be ticked about spending the money and time but if it makes you just a touch safer, it's worth it.