A prosecutor is a lawyer who represents the government in criminal cases, presenting evidence against accused persons and seeking appropriate sentences upon conviction. In Canada, prosecutors are called Crown Attorneys or Crown Prosecutors because they act on behalf of the Crown (the state). Their duty isn't simply to win convictions but to ensure justice is served, which includes disclosing evidence to the defence. Federal prosecutors handle cases involving federal law like drug trafficking, while provincial prosecutors handle most Criminal Code offences. Prosecutors decide whether to proceed with charges, what charges to lay, and whether to offer plea bargains.