Like meds, psychosis has to be fully cleared from your system. That takes most probably longer than a week (think months).

If you now don't trust your son, it may mean a delusion will (trans)form where you doubts you in particular. That one will probably not persist for very long, but it would make things worse.

He is unlikely to induce persecutory delusions unless it's some self-harming behaviour. I may do that, so it's possible, but not a few times a month. I mean, if that is what he's doing he has far worse and different problems. Psychodynamic/psychological.

So I'd give him the benefit of the doubt (also so he may do the same in judging your intentions).

Edit:
Actually I did it twice. Only one time knowingly after a long time of stability and no delusions. I only thought about doing it again, from time to time. That's enough. I got a circus of problems from it, though. But it's all relative.