Oops guess I'm wrong. Pacquiao will go through the blood test, just not during training camp, but before the press conference and after the fight he would do the test.

He, Pacquiao, would only agree to have blood drawn before the kick-off press conference and after the fight."

Blood-testing flap could nix Manny Pacquiao-Floyd Mayweather fight - Chris Mannix - SI.com
That's from the link I posted on the previous page and it also mentions that in the first article on the 1st page. I guess it's not a problem for Pacquiao but when it's done that is the problem.