What are the responsibilities of trainers if any?

I have received my first driving ticket in 20 years

After completing 4 weeks at CDL school to aquire my license i was informed that the "real" training begins with the 275 hours with a trainer. After two weeks the dispatchers began running us as a team. On one day my trainer told me he was sleeping till 9am so I took the time to do laundry and dinner. I didn't get in the sleeper until 4am so needless to say I was upset when my trainer woke me up 2 hours later at 6, telling me to drive. I drove for 7 hours through Colorado and my trainer took over. I went into the sleeper for 10 hours, but honestly didn't sleep too good. Anyway I took over again in Nevada and drove to drop a load in San Bernardino. Next had to bobtail to San Diego, but about halfway there I suddenly became aware that I was too tired so I began looking for a rest area to pull over. At this exact moment almost on que, my trainer hops in the front seat so I told him "I'm too tired and need to pull over", however he encouraged me to keep going to San Diego (about 45 miles) and assured that he would drive from there. I reluctantly took his advice. Then about 5 minutes later, during my first time in bumper to bumper rush hour traffic on the I-15, it emptied out into a 5 or 6 lane highway and I became overwhelmed and slightly confused about which lane to drive. So i did what could arguably be called a sensible response: I asked my trainer. I said "should I drive in this lane? I'm not sure". He responded "I DON'T f****** KNOW"! About 5 minutes later, as my trainer is literally smacking the quelcom and screaming at it (apparently didn't like a message from the dispatcher), I noticed the CHP officer following me. He pulled me over and asked why I was in the second to left lane? I had no excuse so I replied that I was sorry and was a new driver unfamiliar with that particular stretch of highway. He then asked my trainer "why are you letting him drive in that lane?" My trainer just said he "just woke up" which is a complete lie.

My question is what responsibility if any does my trainer have in this situation, and are there any people who can advise me on how I should proceed to deal with this ticket in court?

Thank you.