When I used to work as a security guard, I used to cheat my security rounds. Who wanted to make a round every hour or 30 mins.
Things changed like 8 years ago, now every security guard needs to scan a bar code at various places to show that he/she is indeed doing his/her rounds.
Take photo of each barcode, print, scan in sequence... I imagine location would be tracked in tandem making it harder, or obviously suspect if there is no location data provided. It’s all very short sighted, they will eventually be caught & fired, most likely through non-technical means.
With scan card access system, the security guards need to scan their passes when doing the rounds.
Pretty easy to look at their scan logs and infer what they were doing.
Using bar codes seems relatively easy to fake, but if you have the infrastructure in place then the access scanner seems to address that concern. Main issue is having the access control in the first place - won't help you if the guards are 'inside' the scanner and would never need to swipe while doing their rounds.
At my work you have to scan to use the lifts, so you can see how long the guards take to do each floor in the logs.
The barcode is on their badge, the scanners are at the checkpoints. You could scan a copy, but if you're the only person in the building you'll still have to go to each scanner.
Things changed like 8 years ago, now every security guard needs to scan a bar code at various places to show that he/she is indeed doing his/her rounds.