Ok, it is very possible for a variety reasons, and just as an aside, you have the right to have them measure them in front of you to verify the measurements.
Now as to the reasons - one obviously is driver braking habit. The other 2 main reasons are either sticking caliper pistons or sticking caliper slides and hardware, so these need to be inspected.
But there is an easy way to tell. If the inboard and outboard pad are worn evenly and same thickness, then it is driver braking habit. If the inboard pad is worn more than the outboard pad it is due to sticking caliper pistons. If the outboard pad is worn more than the inboard pad, it is due to caliper slides and hardware.
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