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:
He was pardoned in 2011 at the age of 61. Obama has issued fewer pardons than any president since James Garfield, who served just 199 days in office, and fewer than any two-term president since George Washington, according to Ruckman, a Rock Valley College professor who tracks clemency trends on the blog Pardon Power.