The Tests were a series of protocols originally conducted in the United States in the 1800s to determine if someone was either a witch or possessed by a demonic spirit.

Teal'c of Chulak was put on trial and subjected to the Tests due to being accused and also because he had a mark of the Devil on his forehead, in reality the symbol of his former Master, Apophis. Dr. Daniel Jackson told Colonel Jack O'Neill and Captain Samantha Carter of the Tests that Teal'c was subjected to: branding the mark of the devil where the accused felt no pain (Teal'c's Apophis symbol) and trial by water, where weights are tied to the accused, who was dropped into a lake/river - if they floated they were guilty, if they sank they were innocent - but dead by drowning! (SG1: "Demons")