Is it right to trick someone?

[Duchess]

Say you suspect someone is lying. Is it right to trick them, tempt them almost, setting a trap even and seeing if they fall for it?

I mean, if one has to go to such lengths to prove to themselves something they probably already know-now it is just for entertainment sake.

And furthermore if a person has to set up a trap on somebody there is already a lack of trust and the "relationship" whatever it was should be terminated in my opinion.

If the relationship has deteriorated to the point where words like trapping & tricking are being used then it's probably time to just call it a day and move on. If those are things someone is thinking about doing then the person is lowering themself to a very bad level.