1. Six presidents have pardoned felons who attempted to assassinate their predecessors.

2. On his last day in office, George Washington pardoned a rum smuggler named David Blair (Washington's reasons were not disclosed, but it was widely known that Blair had really good rum.)

3. Although 400,000 Americans were jailed for drug-related crimes during his term - and more than 1,000 requests for clemency denied - George Bush granted a presidential pardon to Pakistani drug dealer Aslam Adam, who had been caught with $1.5 million worth of heroin.

4. The Justice Department has an eight-step process for approving them, including FBI background checks, victm interviews and a "display of good conduct" test. The application process can take over 2 years!

5. Marc Rich's application went directly from his lawyers to Clinton's desk.

6. Jimmy Hoffa, three times rejected for parole, filed for clemency on Dec. 17th, 1971, and was pardoned eight years later by Richard Nixon.

7. This one took a little longer: the first posthumous pardon was for Henry O. Flipper - the first black U.S. Army officer and a former slave convicted of embezzling government funds - was pardoned by Clinton 117 years after he was dishonorably discharged from the army.

8. Among Clinton's pardons: Carlos Vignali, who was caught with 800 pounds of cocaine; a commercial pilot who flew drunk; and a woman who gave Hillary Clinton a gift containing a bald-eagle feather.

9. Congressman Henry A. Waxman - chairman of the House committee investigating Clinton's pardons - called the White House seeking a pardon for junk-bond king Michael Milken before Clinton left office (The request was denied).

10. The only presidents who never issued one were James Garfield and William Henry Harrison (Garfield served less than a year; Harrison died 30 days after his inauguration, he was assassinated).

11. Franklin D. Roosevelt issued the most: 3,687 over four terms. (He also detained 16,849 Japanese Americans in internment camps, another record.)

12. George (not W.) Bush granted the least (77) among full-term presidents since John Adams (21), not a surprise considering George (the W.) Bush's attitudes toward death row.

13. One of those 77 was Caspar Weinberger, just two weeks before he was due to stand trial for his part in the Iran-Contra scandal. Bush had been scheduled to give potentially self-incriminating testimony at that trial.

14. John Adams had many of his opponents imprisoned under Alien and Sedition acts. (After he was re-elected, he pardoned them).

15. The president has unchecked power on pardons: he does not have to consult anyone, except in cases of a previous president's impeachment.

16. Richard Nixon is still the only president who has received one.

17. The biggest: in 1986, Ronald Reagan granted permanent legal residency for 2.7 million illegal aliens.

18. President Truman gave his CIA director, Walter Bedell Smith, an undated presidential pardon known as a "blanket." Theoretically, Smith could've killed Truman and eluded prosecution.

19. Attorney General Robert Kennedy changed the laws governing pardons so that all requests went from the Justice Department to the White House (previously, it was the other way around).

20. More than 27,000 have been granted.