How to determine effective permissions and how granted for a local or domain account
In the Server you can look for 

exec sp_helpsrvrolemember sysadmin exec sp_helpsrvrolemember dbcreator


In the databases that you want

exec sp_helprolemember db_datareader
exec sp_helprolemember db_datawriter
exec sp_helprolemember db_ddladmin
exec sp_helprolemember db_owner


and all direct permissions

exec sp_helprotect null,null