स्वयमुद्बद्धस्य वा विप्रकारमयुक्तं मार्गेत ॥ कZ_०४.७.१६ ॥
svayamudbaddhasya vā viprakāramayuktaṃ mārgeta
Or, in the case of one who has hanged himself, he should look for an inconsistency—something improper or incongruent in the manner/circumstances.
Look for 'ayukta/viprakāra'—mismatches between the claimed manner of death and the physical/social circumstances, indicating possible staging or coercion.