Part I: Card Game Cheating · SLEIGHT-OF-HAND TECHNIQUES

Shiner (Mirror Device)

How it works

A shiner (also called a “glim” or “light”) is a small concealed mirror used to see card faces that would otherwise be hidden. The cheater places the mirror in a position to reflect card values - hidden in the palm, behind a chip stack, inside a cigarette pack, attached to a coin, or even concealed in a toothpick. When dealing or handling cards, the mirror reflects the card indices to the cheater, allowing them to see cards they shouldn’t be able to see. Shiners have been made in countless forms, from simple flat mirrors to elaborate mechanical devices.

Where it appears

Poker, private games

On the record

Shiners have been documented since the 19th century. Historical gambling literature describes shiners concealed in coins, tobacco pipes, toothpicks, rings, and even cobblers’ wax attached to the palm. They remain relevant today as a low-tech but effective cheating tool.

Published as a detection reference for surveillance, compliance and gaming-operations professionals. Thresholds and tuning are set by the property. Nothing here is instruction — the method is described so it can be recognised.