A suburban Chicago Catholic high school is randomly testing students to see if they've consumed alcohol in the past three months.
The testing began this week at St. Viator High School. Administrators say they plan to test 10 to 20 students a week by taking about 60 strands of hair that will be tested by a California lab.
The analysis will show if a student consumed drugs or alcohol in the past 90 days and how much they ingested.
Students who fail the first test will have to meet with their parents and administrators and pay for another test in 90 days. A second failed test can lead to disciplinary action.
The school informed parents of the testing policy over the summer.