Define the term domestic 'false flag operations' and the term domestic 'sting operations'

Please define the term domestic 'false flag operations' and the term domestic 'sting operations'. What is the difference between a 'false flag operation' and a 'sting operation' when both are conducted within the USA? What are the legal restrictions on both? What are the tribunal admissibility aspects of the information alledgedly gained by both type of operations?