Nothing done by force by State agents, absent a warrant, a court order to do so, or an emergency under the police's community caretaking function is lawful. Did the officers have consent of the parents to administer the breathalyzer tests? Did the child consent to the tests? If not, the results of the testing may be subject to suppression at a court hearing. That's a general opinion, however, and not meant to be legal advice in your specific case or the forming of an attorney-client relationship. For that I would need to interview individuals involved, read the police reports and research the facts surrounding this apparent "forceful" administration of breath tests.