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:
Article II of the United States Constitution gives the president the power of clemency. The two most commonly used clemency powers are those of pardon and commutation. A pardon is an official forgiveness for an acknowledged crime. Once a pardon is issued, all punishment for the crime is waived.