Frog1234,
The only way you would be able to tell if hes not drinking if hes doing soberlink. I found out my AW was drinking before I even got home from work and I never new it. She would never drive the kids anywhere when she had drank, but I had no clue that she had already had alcohol in her system.
Until you can feel good in your heart that they will be safe there for 24 hours you should stick to phase 2.
Keep being strong for you and your kids and keep coming back we are here for you. Have a great day.