The Detective can compare the alignments of two players, including himself. He will then be informed whether the players' alignments are the same or different. Two different Neutral roles will have different alignments.
- When deciding whether to compare yourself with a player or two other players, keep in mind the advantages and disadvantages of both.
- If you check yourself and another player, you are guaranteed to find out whether they are Innocent (even the Imposter impersonating an Innocent role will appear to have a different alignment from you). Such result can vary in usefulness: if you find an Innocent player, you may be able to confirm them if you're lucky, but if they confirm themselves during the Interrogation, your findings won't be useful. And if you find a non-Innocent player with Neutrals in the setup, you don't know whether they are a Bank Robber or a Neutral.
- If you decide to check two other players, then similarly to checking yourself, you might find yourself in a situation where your results don't matter - for example, when two players with the same alignment back each other up, or when two players with a different alignment counterclaim each other. However, you may also find essential information - especially if one of the players you pick confirms themselves as Innocent.
- Another scenario when checking two other players can help is when a player claims Shoplifter stealing another player's card, but you know they have different alignments. What this most likely means is that the player claiming Shoplifter is actually Plant. Overall, the information you get after checking two other players isn't as definite as when you check yourself with another player, but can potentially prove more useful in the long run.