When the High Court will actually interfere
The inherent power is used sparingly, and being innocent is not by itself a ground: that is what a trial decides. The categories where petitions succeed are reasonably well settled.
Matrimonial cases and settlement quashing
A large share of quash petitions in Chennai arise from Section 498A / Section 85 BNS complaints that are settled as part of a divorce. Where a mutual consent divorce has been worked out and the complaint is withdrawn as part of that settlement, the High Court will usually quash the criminal case rather than leave it hanging over the parties.
Sequencing matters. We ordinarily want the settlement terms recorded, the divorce petition filed, and the quash petition moved together, so neither side is exposed if the other resiles.
What it involves and how long it takes
The petition is filed in the Madras High Court with the FIR, the chargesheet if filed, and the material showing why the proceedings should not continue. The State is a necessary respondent, and the complainant is heard. Interim orders staying arrest or further proceedings are sometimes granted at admission.
Timelines vary widely with the category. A settlement-based matrimonial quash where both sides appear and consent can conclude in a few months. A contested petition arguing that no offence is disclosed takes considerably longer.