Too many variables exist to make an educated guess about an answer. The circumstances drive the analysis.
Does your daughter attend a public or private school? Did the Principal advise the police to give the officer probable cause that your daughter had an illegal drink underage? Did she take an illegal drink underage? Was it in a public place? DId your daughter understand and waive Miranda protections to have a lawyer present? Did your daughter acknowledge in the presence of the officer that she had alcohol and was underage?
Bottom line is there are a host of valid reasons for the police to respond to the Principal about an underage person taking alcohol. And I do not think any of those valid reasons require the parents being present unless your daughter asked for you and was denied.
Consult with the Prinicipal directly to get to the bottom of your questions. And remind your daughter about the age limit in place for legally drinking alcohol.
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Yes, the officer can ask your daughter to take a breath alcohol test. The officer can do so without you being present. In Oregon the offense of being a minor and having consumed alcoholic beverage is known as "Minor in Possession" of alcohol. It is a violation. It carries with it potential fines and driver license suspensions. The officer did not have to give your daughter Miranda warnings. He did so to avoid any hint of coercion. I do not see anything legally wrong with the officer's actions. However, I do understand why you would be upset.
in oregon the answer is...yes. in oregon, a police officer controls his/her investigation. if it involves a minor, that fact does not change. many law enforcement officers will consider involving parents as parents frequently want their child to cooperate with and respect police. parents can often assist reluctant kids to cooperate with police. but those decisions are made in the field by police in oregon. this is not true in all jurisdictions. and remeber, when it comes to investigating crimes involving kids, parents/guardians are often suspects. how smart would it be to give the suspect the ability to shut down law enforcement efforts to build a case.