I do several id checks a day on average, using a computer system. It works well 95% of the time.
Yes, police would have to do, you know, police work. It isn't foolproof but it helps.
I'm honestly confused as to your objection.
Perhaps your confusion is my fault.
A firearms purchase background check is not an "id check." It requires filling out a form, (ATF 4473) the content of which is then submitted by a licensed firearms dealer to (in Colorado) the Colorado Bureau of Investigation, where over worked datamonkeys check the information submitted against several databases. If the submitted information does not raise flags the purchase can proceed. Normally this takes 8 to 20 minutes, but the post-Sandy Hook panic purchase frenzy put sufficient backlog of requests that for a while it was 8 to 10 days. I don't have actual data to support this theory, but talking with people behind the counter at my local pawn shops and one of the sporting goods stores lead me to believe that many people were submitting 4473's at multiple locations. Colorado might start charging a fee to submit the 4473, which might or might not cut back on this kind of thing.
If a person buys a firearm from online auction site Gunbroker, the firearm will be shipped to a licensed dealer who will, for a fee of $30 average, perform the background check and do any other required paperwork to transfer the firearm from state-to-state.
Now, we in CO have a new requirement to perform background checks for person-to-person sales.
http://www.jamestownsun.com/event/article/id/182263/group/News/
My objection is not that this law puts an undue burden or expense on the consumer, nor that it violates the 2nd amendment. My objection is that many consumers will either tell themselves it does or simply object to the requirement, making the law a waste of time for legislators to pass and a waste of time for police departments if they're required to go wumpus-hunting for illegal transactions (like my laundromat bulletin board example upthread). Unlike a firearm purchase that involves the US Postal system, a person-to-person transaction has
no control point to enforce compliance. The law is stupid because it's unenforceable. Several county sheriffs have already gone on record with the same objection.
http://www.csmonitor.com/USA/2013/0...nforce-Colorado-s-tough-new-gun-control-bills
{edit to add}
So what's going to happen is a large number of scofflaws, 2nd amendment evangelists and general nonconformists will find ways to have these transactions without complying. For example, the other day I saw an image on randompics of a craigslist ad or something for a $1600 "toilet paper holder" -- an AR15 with a roll of TP on the barrel sitting on a coffee table. Stupid, yes, but only one of many possible dodges people will try.
{eta again: found image}
http://www.randompics.net/?p=56550