stacking stealth detection?Follow

Does different sources of stealth detection 'stack' with eachother increasing your over-all stealth detection? ive had different sources on a couple characters, but i never noticed a significant difference. So, in proportion to a hunter... does Track hidden, engineering goggles, and say catseye elixir all stack with eachother giving you an awesome detection of stealth? or does it simply negate the lesser stealth detection and only considers the highest form of stealth detection active?(Track Hidden}

Was planning on dropping alchemy for engineering, for the goggles to add to my immense stealth detection. But if someone can confirm that different sources of stealth detection wont stack, ill just keep alchemy.