You presume that because a record is gone from one place that it's gone from all records?
Let me give you an example of how this doesn't work out so well. I'm a Canadian, been living here since 2007, but in the past, lots of folks got into trouble travelling to the US.
They'd get caught with some kind of drug, get convicted, and find out that the US wouldn't let them in with it. So, they'd apply for, and receive, a pardon for the crime, only to learn that the US maintained their own database, and once the conviction showed up on the record, the border folks had that record forever...moreover, because of the pardon, the record of the conviction was now sealed, so applying for a waiver of inadmissibility was almost impossible to do now, as you could not get the records of the original conviction to submit.