The way I see it there are two scenarios:
1. Drouin is telling the truth, KL is corrupt. LTC is mafia.
2. Drouin is mafia, VIC or I are likely corrupt. LTC's affiliation is unknown, likely TP.
imo both these scenarios are solved by lynching Drouin. If Drouin turns up TP then KL is 100% certainly corrupt. LTC is also mafia.
If Drouin turns up mafia then we can lynch one of VIC or I next round.