[Mindstormy]

Is it legal or even possible to prevent these scanning devices from working by having say a ring of infrared LED's shining on your license plate to prevent a camera from being able to capture it?

[Crito]

I believe that some states have laws against devices used to obscure your plate to cameras, but I am not sure about that.

If not, that trick would only work on shitty cameras for so long, before manufacturers of these scanners wizened up.

[zxexz]

I'd say just cover the end of your driveway in mud, and 'accidentally' back up as fast as you can.