Was This Informed Consent?

If researchers tell a small tribe of American Indians they're going to use blood to examine causes of diabetes and the donors find out it was also used to test for the effects of incest, I suspect the urge to sue will quickly ensue. 

Blood feud in the Grand Canyon | Top Feeds News

What was advertised as an exercise in benevolence began in 1990 when an ASU scientist approached the tribe with an idea: its members had for years suffered from an unusually elevated rate of type 2 diabetes, ravaging its ranks and leading to amputations even among some of its young. If tribe members would agree to surrender some of their blood, the university would try to establish what genetic links might lurk behind its struggles with the disease.

This was no easy decision for the Indians, for whom blood holds grave sacred significance.