The foster mother of a 16-year-old adolescent calls the office to make an appointment. She suspects that the adolescent is "doing drugs" and wants to secretly test for drugs. Which one of the following responses is most appropriate?
A) Explain that such drug testing is unethical
B) Tell the foster mother that drug use is rare in 16-year-old adolescents
C) Schedule an appointment for the adolescent to be tested
D) Schedule separate appointments for the foster mother and the adolescent