If you have been arrested before why would your PNC check be clear?

A clear PNC (Police National Computer) check despite a prior arrest could indicate that the arrest did not result in a conviction, meaning charges were dropped or the individual was acquitted. Additionally, if the arrest was for a minor offense, it may have been expunged or not recorded in a way that shows up on a background check. Lastly, a PNC check may only reveal certain types of offenses, depending on the context of the check being performed.