The FBI illustrates the perfect point about the NICS systems deficiencies:
"State and local authorities serving as POCs are likely to have readier access to more detailed information for processing background checks than the FBI, thus resulting in fewer system misses of disqualified persons and enhancing system responsiveness for non-disqualified persons. The POCs have access to more current criminal history record and more data sources (particularly regarding noncriminal disqualifiers such as mental health commitments) from their own state than does the FBI, and have a better understanding of their own state laws and disqualifying factors. Specifically, the POC for Nevada checks additional databases to include state protection orders, state warrants, state driver's licenses, parole and probation, and SCOPE (which is Clark County, Las Vegas area records). Also, most of Nevada's protection orders are not in the National Crime Information Center File, which is important to note since only the POC has access to these protections orders and if the FBI were processing background checks on private party sales of firearms for Nevada, these protection orders would not be part of the NICS check.
"The state of Nevada can provide a more comprehensive NICS check that is accomplished when a POC access state-held databases that are not available to the FBI. The Nevada DPS is also in a better position for understanding and applying state laws."