Medications might also cause a drop in blood pressure. Beta-blockers and nitroglycerin, used to treat heart disease, are common culprits. Diuretics, tricyclic antidepressants, and erectile dysfunction drugs can also cause hypotension. Some people have low blood pressure for unknown reasons.
Theoretically, then, the President can probably pardon him/her-self for any Federal crime â but this only prevents actual prosecution for that crime, not impeachment for the crime itself. Prior Answer, to the hypothetical of the VP murdering the President and then pardoning himself:
Legally, the president may pardon whomever he wants, whenever he wants, for whatever reason he wants, for any and all violations of federal law. (He has no power to grant pardons for state-law violations.) He may pardon crooks, cronies, and co-conspirators in his own corruption ...