09 Entrapment by Estoppel is a legal doctrine in which a party can be held liable for their conduct even if it is not illegal. This doctrine applies when one party has induced the other to act in a certain way, and then attempts to hold them legally liable for that action. This type of entrapment can be broken down into two types: contractual and equitable estoppel. Contractual estoppel occurs when one party has made a promise to another party, and the other party has relied on that promise to their detriment. Equitable estoppel is when a party has taken action in reliance on a representation made by another party, and then the other party attempts to deny the representation. In either case, the estoppel prevents the party from denying the representation or promise.