It is automatically considered entrapment in the United States if the police sell you illegal substances without revealing themselves.

The answer is false because entrapment in the United States requires more than just the police selling illegal substances without revealing themselves. Entrapment refers to the act of law enforcement inducing or persuading an individual to commit a crime they would not have otherwise committed. It requires coercion, persuasion, or encouragement by the police that would create a substantial risk of inducing an otherwise law-abiding person to commit a crime. Simply selling illegal substances without revealing themselves does not automatically meet the criteria for entrapment; there needs to be evidence of inducement or persuasion on the part of law enforcement.