Detecting fake IDs and DLs?

I work at a Valero. Before I got hired on, I had to take my TABC. I have to admit, although I did pass the test, I learned it's not so easy to detect a fake ID as how my test made it sound. I am from Texas and see Texas IDs and DLs daily from cigarette and alcohol purchases. My main concern is, if there is any way possible to detect a fake by just observing it, besides the basic stuff like feeling the ridges, the magnetic strip, and the UV logo under the surface. I know there's many legit fakes out there, so I want to become excellent at detecting these things. One more question...does every ID or DL have a magnetic strip? I have come across a few from different states without it, that only have what seems to look like a large barcode. Could this be a sign of it being fake?