How can detective legacy turn suspects/rivals into followers?

The "detective" legacy is great – in my opinion it is the easiest legacy to make money: with barely 1 REASON you have guaranteed 2 x FUNDS, which goes can go up when you make progress (and you can increase the chance for the progress by dumping more REASON cards into investigation) in the investigation up to (I think) +8 when you manage to arrest the suspect.

Unfortunately, those suspects are taken from the same pool of characters as your potential followers, which means that your cult will lack in members (in my current game I don’t have a single WINTER follower!).

However, since the suspect is just a card, can you somehow convince them to join your side? I’ve tried to TALK to them but the only results was more notoriety cards.