[ECDub]

After Mike mentioned it was top secret, I had to look up what Juice was...lol. I found it sold in small kits, usually for magicians, but I guess cheaters can use it too. Here is a little of the ad for it:

What is the juice? The JUICE! is a special liquid. When it is touched to the back of a deck of cards, it leaves invisible markings. What good are invisible marks? Though an audience can not see these markings - even under bright lighting and close inspection - they will stand out to you as if they were neon signs! No special glasses or other device is needed. You will be able to easily identify any card from its back - even across the room!


Anyway, if anyone else was curious, there you go. The real cheaters either already know about it or will get their hands on it anyway. The rest of us may as well have a clue what is out there as well.