Hello...thank you for using Just Answer. It probably was difficult that you confronted your son about his pot usage but very admirable that you did. Your best bet is to keep the lines of communication open as well as honest between you and your son as well as follow through on any consequences that you have told him. The residing director of the Teen Mania Ministries may need to become a mentor for your son especially if he is someone that your son can trust. If there is any way possible, continue to have that director keep in contact with your son to guide him on the right track....staying away from pot. You keep doing your part and hopefully the director can assist as well. Once your son stays away from pot, maybe he can even give testimonies to other teens to assist them. What an awesome ministry that would be!!! Your son is now an adult but if he is still living under the roof of your house, he needs to abide by the house rules.
You may also try counseling for your son from another source to get a second opinion and more intervention strategies.
If more advice is needed, just ask. Thank you and have a great day.
Since the other person was of age and may still be giving minors access to drugs, the video could be used as evidence against him if charges have or will be pressed. You can give the video to the police and then they will decide what course of action to take.