Kim: What your particular state law says may make all the difference.
The state UTMA laws ive seen (and I certainly havent seen them all) have provided specific protections to 3rd parties (like banks) but only when the 3rd party deals only w/the custodian. By dealing with the (minor?), your bank may be giving up a big protection under state law, particularly if there is a ? later about whether the (minor?) should have had the $ or if it was misspent.
As for the (minor?) his recourse (and that of the custodian) is to go to the entity that is issuing the check and get the check re-issued in the name of the (minor?) only. The issuer of the check will have a field day against your bank if the $ is misspent, b/c it protected itself by issuing the check to the custodian, but your bank lost this protection when it dealt with the (minor?) and not the custodian.
Alternatively, you could analyze the check as you would any other:
(a) if a check payable to Sam Smith is presented by Sally Field and Sam's endorsement is on the check, do we feel comfortable allowing Sally to deposit/cash the check?
To a degree, I dont see the difference btwn your situation and this hypo.
A lazy custodian that either doesnt want to open a UTMA acct w/your bank or go to the source (the issuer) and get the checks issued to the (minor?) directly (if this si appropriate at all) shouldnt be allowed to expose your bank to this type of risk. After all, what is your bank getting in return for accepting this risk? Is this a 6 figure CD or a checking acct w/an avg collected balance of $1K?
I AM NOT ENGAGED IN PROVIDING LEGAL ADVICE AND THE VIEWS EXPRESSED ARE NOT THOSE OF MY EMPLOYER