As long as the pardon met the conditions of the Constitution, as discussed below, it would have to be found within the President's powers. Besides, it would require a case be first brought to the Court through appeal and the plaintiff would have to show injury from the pardon. I can't imagine what that would include.
Organic fruits and vegetables also contain higher amounts of Vitamin A, Vitamin C, and sulfur, which all boost liver detoxification and cleansing. Broccoli, Brussels sprouts, kale, collards, apples, onions, garlic, and squash are all great choices. Also see: 10 Foods to Cleanse and Care for Your Liver.
There are plenty of ways to detox your body without dieting. My advice is to incorporate moderate, but regular amounts of these foods in your diet on a regular basis. Along with plenty of fresh water, your liver will be loving you in no time. Check out my Facebook page for a great liver detoxing tea I just posted.