“BRAZEN” and “absurd”: Allergan certainly drew a reaction from American lawmakers when it transferred its patents for Restasis, a dry-eye drug, to the Saint Regis Mohawk Tribe in September. Last week a congressional committee held a hearing on the deal, which, if recognised as valid, risks undermining the American patent-review system. As entities granted sovereign status, Native American tribes enjoy legal immunity and so, Allergan hopes, can ward off challenges to the patents by rival drugmakers.