Non-contact thermometers used by China in screening for coronavirus (2019-nCoV)
This consumer forehead one has 0.1°C resolution and they're essentially calibrating it with each "customer" so I would imagine it would be pretty good for finding outliers. 



The forehead temperature is not going to match internal temperature or tympanic temperature but it might be good enough to find people with fevers. The particular product I linked claims +/-0.2°C accuracy. 

It's designed specifically for measuring human skin temperature looking for fevers so it's not your Harbor Freight special for measuring a BBQ. 

Hong Kong uses IR cameras for their post-SARS scanning, and I'm not sure they're any better. They're more efficient though, since they can scan people just walking by. 

Among other things, the reading on an IR thermometer depends on the emissivity of the surface and the temperature of the sensor (the compensation may not be able to track fast slews). I would have guessed emissivity would vary quite a bit, but this source claims: 


  In medical thermography we don’t encounter the same range of emissivity values because human skin is almost a perfect
  emitter, or blackbody, with an emissivity
  that is approximately 0.98


Which is a much better situation than trying to measure random items, which may be reflective or have other issues. 

Because of the inherently poor match, I would think a tympanic type or a combo tympanic-forehead type would be best for home use (one could match the forehead reading the tympanic reading and get an idea whether it's worth shoving the tip into the kid's ear, which some kids don't like much), but that's just my opinion. Personally we used the tympanic IR type with ours. Note that it's still the same type of IR sensor, it's just got a  much better target to 'see'.