Nope, it is not : you said "Network drives mapped as a regular user are not visible to admins." wich implies (LOGICAL DEDUCTION) that it is supposed to recognize network drives mapped by administrators, wich I am. ^^
The part "mapped by regular user" is the part on wich you are stuck.
Not mentioning that for an admin to not be allowed to see folder on wich there is a basic "user authorization" is a total stupidity : it's like avoiding a boss to enter its enterprise just because he has the level of a user and of a chief. >_< RULES ARE NESTED, and the highest takes precedence on the LOWEST.