On Mo 20 year old son charge with driving under influence,due to zero tolerance recd unsupervised probation now probation violation with second charge

Actually he had only used mouthwash immediately prior to be stopped, maybe 5 mins. Went to court with attorney recd unsupervised probation and revocation of driving due to MO zero tolerance, Attorney did not try to een prove mouthwash even though had bottle with alcohol content. He violated probation by driving while revoked and then was charged with no insurance(though car was not his) and drug paraphenlia in care At preliminary was given 2 weeks to get attorney, though he cannot afford one. ALL other cases were offered public defenders. Checked and the office said they could not defend him due to "no jail time as punishment" He has no idea what to expect, but the situation in our town is that it will not be a good outcome. People without represnetation received much harsher punishment than those who have repeated felongy drug offense breaking and entering, multiple offense who have atorneys. Please advise.