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:
The following list of people pardoned or granted clemency by the President of the United States lists notable cases of each presidency. The President exercises broad authority, in granting pardons, beyond the specific stipulations of the Constitution's prose encompassing instead the spirit of its framers intent.