[quote=@Dark Jack]
"Filter"... by which you would mean that he would be able to block out certain energy patterns? Eh, I'm sorry, but sniffers actually don't work that way. That's the reason so many sniffers end up losing themselves and turn numb: they are literally incapable of shutting out anything within range of their senses, and are uncontrollably bombarded with awareness of every bit of magical energy in their vicinity.
"Filtering" magical effects would be similarly improbable (borderline impossible). The only way to actually block out mind-affecting magic is with magic of one's own, which sniffers are inherently incapable of. The only way one could get away from mind-affecting magic without using magic oneself would be to simply shake it off and break it with one's will and intellect.
[/quote]

Okie doke then - edited my post to reflect this ruling. :3