Cops generally don't do this. They don't list all the defects even if they are obvious (in my case big turbo, blow off, cooler, pod). All they do is list few (in my case too low) and tick RWC required. RWC covers the lot, so no point in giving a 10 point defect list, waste of time.
So getting a defect on top of exisitng one makes no sense to me UNLESS, they fine you, or change the conditions of the defect ie, bring the car the cop shop for inspection.