दूष्यस्य वा भृतकव्यञ्जनो वेतनहिरण्ये कूटरूपं प्रक्षिप्य प्ररूपयेत् ॥ कZ_०५.२.६६ ॥
dūṣyasya vā bhṛtakavyañjano vetanahiraṇye kūṭarūpaṃ prakṣipya prarūpayet
Or, in the case of a corruptible target, an agent disguised as a hired servant should slip counterfeit coin into his wage-gold and then expose it (as evidence).
To create a prosecutable pretext (possession of counterfeit) enabling detention and interrogation of a suspect deemed corruptible.