Question About New Yordle Snap Trap

So I read the patch notes and as I understand: Champions will not be snared for a certain amount of time after having previously been trapped (See: "A Little Breathing Room: Caitlyn can no longer re-trap a trapped target"). Does that mean I can't double-stack traps on a trapped target ( I guess That makes sense at least)? Will they be immune to the snare for a few seconds after? And if they are immune to the snare will they still set the trap off without being snared? Anyone that can provide a little clarity please? Thanks. -Haunty