category of offences as per Criminal Procedure Code (CrPC) in which Police can neither register the FIR nor can investigate or effect arrest without the express permission or directions from the court are known as Non-cognizable offences.
2) it need not be drafted by lawyer
3) if you want court to take action you can file complaint before court to direct police to investigate and submit report
4) you don't need to serve copy of complaint on accused entwined in NC complaint