Paul McCartney recently gave a BBC radio interview in which he seemed to step back from his, and his deceased wife Linda's, hard core animal rights position on animal experimentation.
"I'm finding out now," McCartney told the BBC, "that there is quite a lot of animal experimentation -- some of it I suppose absolutely necessary when you come down to the final tests before people."
McCartney made comments about his wife's treatment for breast Cancer that indicate Linda never knew the drugs she was taking had been tested on animals. He said that doctors treating Linda gave the impression that the drugs they prescribed had not been tested in animals.
"If they tell you 'It's ok to have this because we didn't test it on animals' then you are going to believe them," McCartney said.
In other words, all this time Paul and Linda McCartney went around advocating for animal rights and against animal experimentation, they were so ignorant of the topic that they didn't even know the fundamental basics about the use of animals in drug development and testing.
This is the state of the animal rights movement's knowledge of the use of animals by medical researchers.