Do convicts still make our license plates?

Dear Matt:

Do convicts still make our license plates, or was that all a big story told to us by our mothers?

-- Charlie B., San Diego

I see the cars a-comin',

Rollin' 'round the bend,

And each one has a license plate

Attached to either end.

Oh, they're struck in Folsom Prison,

Three million-plus a year.

They make them in the slammer,

Just like we always hear.

And since they're made at Folsom,

Where time keeps dragging on,

They get away with paying

Criminal wages to each con.

Oh, they're struck in Folsom Prison

By crooks and scalawags,

Which means the guy who ripped your car off

Most likely made your brand-new tags.