I am so glad I don't live in a state where emission testing is required... what a freaking joke... New cars are such that most will trigger an engine light if/when there is an issue with the emission system. Most car owners will get their vehicles fixed.
I seriously doubt the remaining 0.02% that install cat-less mid pipes or disregard the engine light are doing much, if any, harm to the environment
/rant
when clearing codes at work i have noticed, we tend to see the p1000 code come up when a scan tool has been used, and then unplugged without backing out of the program and shutting the scanner off first. you may try to go to a shop you know ask them to scan the car and if no other codes are there, ask them to first exit out of the program shut the programmer off, then turn off car and disconnect scanner. i will say that in most cars the p1000 code by itself won't usually turn the light on
The P1000 is not really an error code. It means that some monitors have not completed. There are valid reasons for some monitors to remain pending. Especially during cold weather or say above 5,000 feet.
I was not aware that any state would not pass the car where the only code is P1000 AND no MIL present.