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Team members' abilities do not stack. The game uses whomevers' ability is highest to determine whether locked objects can be opened or decrypted.

There is an exception to the rule, and that is the first aid ability. It -is- stacked, so it is best to have more than one person with first aid to each have a few points in first aid than to have one person max'ed out in it (do the math, 2 with 1 first aid rank is better than 1 with 5 ranks).