Sense Sonnet - Chiller

Lies Prize

I operate a polygraph,
A lie detector called a lot.
I detect cash on my behalf.
The gizmo's been my own jackpot.
I say to the examinee
If he/she wants to pass the test,
There will be a passing test fee.
At first most think I speak in jest.
But some who have turned down my deal
Have gotten fired or gone to jail.
I tell of this in my appeal.
Most give in and I've made my sale.

Polygraph - my money machine.
I'm not lying - know what I mean?