code/modules/admin/sql_ban_system.dm 
| /proc/is_banned_from | Checks client ban cache or, if it doesn't exist, queries the DB ban table to see if the player's ckey is banned from at least one of the provided roles. |
|---|---|
| /proc/retrieve_ban_cache | Gets the ban cache of the passed in client If the cache has not been generated, we start off a query If we still have a query going for this request, we just sleep until it's received back |