I don’t know much about teacher certification. In my position as special investigator for licensing and disciplinary actions for physicians - we went deep into backgrounds before issuing licenses. A complete CV was required with a timeline beginning with high school graduation up until date of application. All activities, residences, employment and education had to be documented showing the complete life progression with absolutely no gaps in time that couldn’t be accounted for. Even if they were on vacation, sabbatical or unemployed. Any gap of time that was unaccounted for would kick the application out for investigation. It’s a very intensive process. Many interns and residents were not expecting this type of requirement. It would take some several months up to a year to complete the licensure application process.
I'd be surprised if it was quite that extensive for teacher licensure although I know some other background checks for licensure (like Psyc) can be very extensive in some states.
That said, I don't think it's quite as easy to slide by Ed licensure boards in two states as some here seem to think. It's not so easy to use a fake name on a college transcript, for example, especially if there is also borrowing for student loans. And fingerprints are required for licensure in SC and CO (but may not be in some states.)
As I've said before, TS appears to have only one criminal conviction as an adult. Lots of charges in the past but only one conviction. And that was for unauthorized use of a vehicle at the misdemeanor level. (Reduced from felony.) So getting licensure as a teacher in SC and in CO, both of which can be verified, doesn't surprise me.