दोषशुद्धौ हि दूष्या न विद्यन्ते ॥ कZ_०९.५.१८ ॥
doṣaśuddhau hi dūṣyā na vidyante
For when the corrupting factors are purified/removed, there are no persons left who can be corrupted.
'Doṣa' are the corrupting drivers (incentives, vulnerabilities, agitators); 'dūṣya' are the susceptible officials/groups who can be turned.
Prevention: eliminate systemic drivers of corruption/subversion so that susceptibility has no operational pathway.