If the magistrate has issued the process, it does not mean that there are sufficient proofs against the accused.
Sec. 156(3) is the most misused section after 498A. I have seen cases where merely on the basis of complaint to Magistrate and vested witnesses the process was started. You will be amused to note that even the in the case BWs are sent only on file for 3 year and finanlly NBWs were sent. Accused were surprised to see the NBWs. and now accused persons are fighing the case the incident of which never happened