In 1872, President Ulysses S. Grant was arrested for speeding on his horse-drawn carriage in Washington, DC.

Grant apparently had a penchant for speeding and a love for fast horses.

Grant ultimately paid a $20 bond but didn't show up to court.

As President Donald Trump's legal woes grow like an unrelenting fungus, much of the country seems to be sitting and wondering: why hasn't he been charged yet?

The answer is that it's complicated. It's difficult to indict a sitting president, and goes against Justice Department policy. The process surrounding impeachment is also convoluted, and it's unclear whether the crimes in which Trump has been implicated merit going down that road as of yet.

But as legal experts debate this topic, The Washington Post on Sunday reminded us of at least once instance in US history in which a commander-in-chief learned that no person in the country is above the law.

Read more: Trump has been implicated in several federal crimes, but here's why experts say he hasn't faced legal consequences

In 1872, President Ulysses S. Grant was arrested for speeding on his horse-drawn carriage in Washington, DC. This was not an impeachable offense, but Grant still faced consequences.

Grant, the general who helped lead the Union to victory in the Civil War, was arrested at the corner of 13th and M streets in the nation's capital. The story of his arrest was once told in a September 27, 1908, edition of the Washington Evening Star with the headline: "Only Policeman Who Ever Arrested a President."

The police officer who arrested him was a black man who fought in the Civil War named William H. West, who gave his account of the incident to The Star, which The Post dug up.

Grant apparently had a penchant for speeding and a love for fast horses and had more than one run-in with West.

On the first occasion, the president was somewhat sassy with the officer as he stopped his carriage. The city was having problems with speeding at the time, and a mother and child had recently been injured as a result.

Grant said, "Well, officer, what do you want with me?"

West replied, "I want to inform you, Mr. President, that you are violating the law by speeding along this street. Your fast driving, sir, has set the example for a lot of other gentlemen."

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Grant apologized and told the officer it would not happen again.

But on the very next day Grant was speeding so fast through Georgetown in an area West was patrolling it took the officer an entire block to slow the president down.

Grant apparently greeted the officer with a smile and looked like a "schoolboy who had been caught in a guilty act by a teacher."

West informed the president he'd violated the city's speeding laws, again.

"I cautioned you yesterday, Mr. President, about fast driving, and you said, sir, that it would not occur again," West reportedly told Grant. "I am very sorry, Mr. President, to have to do it, for you are the chief of the nation, and I am nothing but a policeman, but duty is duty, sir, and I will have to place you under arrest."

The president and other speeders were taken to the local police station. Officers at the station were reportedly unsure if they could charge a sitting president if he'd not been impeached.

In the end, Grant paid a $20 bond but didn't show up to court.