before and after
The whole vehicle should have a safety inspection every service.
It would depend on the driver's habits and the vehicle. I would recommend they be inspected by a mechanic every 10K or once a year.
Local mechanics or even places such as AutoZone O'Reilys etc. will inspect and often offer an estimate on fixes or repairs if they are needed for you vehicle.
They are inspected at least once a year. Inspections are random - and without warning.
About maybe twice a year
about twice a year
Daily
Very. Dept of weights & measures controls cheating & those that have edibles inspected by Health Dept.
before use
For fish tanks, weekly, at a minimum.
Every six months.
Every day