Maryland has a seven day waiting period for background check, applicable to handguns and some long guns. But State Police have been taking around 100 days to perform the check. Surprise, the Baltimore Sun runs with the headline "Guns Released to Buyer with Criminal Histories."
When asked why not just go with the standard NICS check system, the reply is that Maryland has other prohibited person categories beyond the Federal, with the result that a check requires consulting 16 different databases. Let's see ... amend the law, or hire more people (the article says the backlog started building up in January, so there was plenty of warning), sounds like a solution to me.