Colin Mitchell specialises in making applications for discharges without conviction (s. 106 Sentencing Act 2002), community work in lieu of disqualifications (s. 94 Land Transport Act 1998), and special reasons not to disqualify (s. 81 Land Transport Act 1998).

Colin Mitchell also conducts defended hearings in the District Court. He is sought-after by clients who want him to represent their interests in Court. Colin Mitchell operates primarily in the District Courts of the Auckland Metropolitan area, and takes appeals to the HIgh Court, Court of Appeal, and the Supreme Court.