A year ago my ex and I split due to his alcohol abuse. We planned our own custody of children arrangement which sees him having our two young boys every fortnight for a weekend. On 3-4 occasions, he has brought the children home to me but had been clearly drink driving, and perhaps reckless driving. I do not trust him and do not want him to pick up my children anymore. I understand children need both parents but right now I need advice on what to do next before I lose patience and go for full custody.