Yes.
Yes.
Here's the analogy:
A house plant is the clearance you get once the the gardeners finish cultivating it (completing your investigation). These particular house plants have a 5-year lifespan with regular care (you work a job that requires it), but will survive for only maybe 1 year due to neglect alone (you lose the job requiring it, but not due to a clearance-related violation).
If you start taking care of it again within that 1 year (find a new clearance-required job), it'll stop wilting and live out the remainder of those 5 years.
If, on the other hand, you lost the job because you set the plant on fire or let the neighbor Rabbit munch on it (violated the terms of your clearance), then the plant dies and you restart the whole process when you hire in for a new job that requires it, but it'll be much harder to get the gardeners to trust you with a house plant again.
EDIT: Clarified a point or two.