Right but that doesn't mean that the NICS background check doesn't work, and there have in fact been new legislation put in place to try and help improve the NICS.
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The Fix NICS Act of 2017 is a United States federal law passed as part of the Consolidated Appropriations Act, 2018 signed as Pub.L.115-141 by President Donald Trump on March 23, 2018. The law applies penalties to government agencies for not reporting to the National Instant Criminal Background Check System (NICS)."
Fix NICS Act of 2017 - Wikipedia.
The Department of Justice recently released its first report on the Fix NICS Act, finding,
"-There was an increase of over six million records in the three national databases searched with every NICS check – a 6.2 percent increase.
-The number of Firearm Retrieval Referrals (FRRs) – where a prohibited person is able to purchase a firearm because the background check could not be concluded within three business days due to incomplete records – decreased each month in comparison to the same month during the previous year, for an average monthly decline of 102 FRRs.
-With the exception of one month, there was an increase in the percentage of NICS checks resulting in an immediate determination – not requiring a delay for further research – compared to the previous year."
It's unreasonable to believe that any database is going to be flawless and work every time or that every government employee (in this case anyone responsible for inputting data into any of the databases under the NICS check) or even any employee in general is going to do their job to the T every time. But the NICS background check has served well since 1994. According to a study by the Department of Justice, between 1994 and 2014, federal, state, and local agencies conducted background checks on more than 180 million firearm applications and denied 2.82 million gun sales to prohibited purchasers. To date, the background check system has blocked over 3 million firearm sales to prohibited purchasers.
Source: Karberg JC, Frandsen RJ, Durso JM, et al. "Background Checks for Firearm Transfers, 2013-2014." Bureau of Justice Statistics. https://www.bjs.gov/content/pub/pdf/bcft1314st.pdf. Published June 2016. Accessed November 19, 2019.
There will be some cases where applicants possibly slip through the cracks, and I don't think we should just shrug that off either. Improvements should be made to improve the accuracy and efficiency of the NICS background system. But it is a Federal background check, like you called for.
Now could you please specify the loopholes you were referring to in your previous post?