This may be 'working as intended' but i highly doubt it, therefor i think this is an exploit.
When you normally place a trap on the ground a rogue or any other player close to you would be able to see it. But if you lay the trap down in particular places it becomes invisible I.E you can hide it in the scenery. You can hide your traps in many places such as the pumpkins in AB near the farm or EOTS near the flag.
Here's a picture to show you what i mean:
JustWoW.net World of Warcraft screenshot hosting
Now there in EOTS i hide it near the flag so while i was capping it a rogue wouldnt be able to see the trap and walk straight into it without attacking me first. You can You can still sort of see the blue smoke type thing comming from the frost trap but if you put your spell detail at the lowest you would not be able to see the trap.
This 'exploit' could be very usefull in PvP
P.s Thats the t5 head and shoulders, oh and i apologise for my bad english.![]()