The speaker and his team sneaked into a gated community at night for a security testing without going over the barbed wire or setting off any sensors using the gap on the gate. They were more concerned about the neighbors taking matters into their own hands at the time of civil unrest in America.
Dead latches have an extra post that can be depressed to prevent the latch from being pushed, making it more secure than a typical spring latch. However, improper installation of the dead latch can compromise its effectiveness.