In a book describing the mass murder of 18 people in northern California, a policewoman was quoted as stating that there are blood groups O, A, B, and AB, positive and negative, blood types M, N, MN, and P, and 8 Rh blood types, so there are 288 unique groups (Source: Joseph Harrington and Robert Berger, Eye of Evil, St. Martin's Press, 1993). Comment on this conclusion.