Declining to Participate in Formal Recruitment

[Senusret I]

I would do a search for this, but I'm afraid I wouldn't have the proper terms.

1) Is participating in formal recruitment a requirement for NPC sororities?

2) Can a chapter opt out of formal recruitment if they find that the COB process works better for them? (Assuming they will not be penalized for a smaller pledge class than the rest of the chapters on campus)

3) On your campuses, would/do/have Jewish sororities found it more beneficial to have a COB process than formal recruitment?

I KNOW we discussed this before, but I have no idea where.