My question involves a child custody case from the State of: Michigan

I have 50/50 legal custody and she has primary residency of our 9 mo son. I have had a difficult time with trying to tell the judge how manipulative the mother is and how she lies. We exchange our son at he police station and I always go in by myself. I need some advice on how I can get the judge to listen to me.....recently she has lied to me about our sons 9 mo dr check up. She told me she canceled it and when I called the doctor's office I found out there is an appt set up for next month. This is an on going thing with her and I am getting very tired of the lies. She has a PPO against me because of her lies. (and yes she did lie to the judge on more than one court date) And she has also filed criminal charges (we go to court next week). I am at witsend with this person. Need some advice. Can I use a tape recorder during the exchange? Will I be able to use it as evidence against her? Or should I have a witness?