You can call the dcf hotline and make a formal complaint. You do not say your relationship to9 the child. The childs atty is correct to not speak with you if you are not a party to the case. A judge could order drug testing if necessary, you may not be privy to all the details of the case. Again call the hotline and I hope the child continues to be safe where ever he is placed.
This is not legal advice until I am retained and have reviewed all facts about your situation.
I agree with Attorney Carpenter-if you are not a party to the case, the child's attorney, and the DCF worker are not able to speak with you about the case. If you believe the child is being abused or neglected, you can make a report to the DCF hotline. If the child is in foster care, then the service plan for reunification may require the mother to be drug tested before she can seek to regain custody. Again, if you are not the foster parent or guardian, you will not be given this information. Best of luck to you and this child.
This answer is intended for general informational purposes, and does not create an attorney-client relationship.