The facts:

1) My wifes 97 Lumina (sedan, 3.1) SES light comes on.
2) The car fails NJ state inspection for "random misfire" code. (p06?)
3) The shop where we go does their "fuel injector service". Fixes nothing.
4) All plugs and wires are changed. Car runs much better, but...
5) One cylinder (6), is still misfiring wildly. They pull and clean that fuel injector. All codes seem to disappear and SES light goes out.
6) I have the car reinspected but it FAILS beacuse the OBD gives the inspection guys NOTHING. No codes, no data, no "Not Ready's".
7) I stop at AutoZone on the way home and ask them to pull the codes. Their handheld box just says "Pass".

Questions:
1) Could the "Pass" from AZ be the result of no data at all?
2) Is there a "reset time" on the OBD? (I don't mean drive cycles.)
3) Could this be a fuse or breaker? I looked in the manual for one but could not find anything.

I took it back to original garage, and now they can't get anything from the OBD either. Has anyone seen this before? I honestly don't know where to start troubleshooting.

Any help would be GREATLY appreciated

Do you mean there scanner gets no data, very unclear whats what here. If you cleared the codes it takes a significant "drive cycle " to reset the emissions monitors or it will fail an emissions test. If the scanner doesn't read out anything the fuse can be bad for the cigar liter, I believe on that car.