As a general rule, a buy-bust operation, considered as a form of entrapment, is a valid means of arresting violators of Republic Act No. 9165. It is an effective way of apprehending law offenders in the act of committing a crime. In a buy-bust operation, the idea to commit a crime originates from the offender, without anybody inducing or prodding him to commit the offense.

Contrary to the arguments of accused-appellant, her arrest was pursuant to a valid entrapment operation and was not done through instigation.