As an Ambassador you will be allowed to conduct your own investigations on who ever you wish to do so. You must alert a Director when you are starting it and who it is on however you do not need permission. The Directors may give you a name for the Investigation to use which you must agree to.
At the end of any investigation you must report all findings to a Department Director who will take the appropriate further action.
As a Clearance Level 4 Personnel you will gain access to close and open CL4 bulk head/blast doors. Furthermore you will also get access to the electrical rooms.
Ambassadors are advised to not close and CL4 BH doors asides from the Personnel Wing Blast doors during Code-5s or Code-1s (if bad enough).