这个真的不是很懂

1. Custodian is the key role in monitoring the compliance of investment, client and invest manager will be notified by custodian too. Yet, sometimes the investment manager knows better.
2. Actually it is very important to set firewalls to prevent from moral hazard, so it is a must.
3.it depends on the tools the custodian apply, they can be differ from one to another.
I worked for a great custodian bank before.