If you plan on unlearning some bad habits this year, add this one to your list: Abbreviating the year on your checks and legal documents. As USA Today reports, the practice that was harmless in 2019 could make you vulnerable to fraud in 2020.

Because this year starts and ends with the same two digits, documents dated with the abbreviation 20 are easier to forge. If a scammer wants to make it look like a contract you signed this year was actually filled out last year, all they'd have to do is add 19 at the end of the shortened date. This tactic could be used to trick you (or the authorities) into thinking you owe a debt on payments you haven't agreed to start sending yet.

Abbreviating the year also makes it possible to forge dates in the future. If a check signed this year becomes inactive before it's cashed, someone could possibly change the date to 2021 in an attempt to cash it late.

Fortunately, this is one potential scam that's easy to combat. When signing important documents this year, always take the extra second to write the full date. This makes the date much harder to tamper with. It's the same reason you should always fill the entire line of the check when writing the payment amount.

Looking for more ways to protect yourself from scams? Here are some habits that could leave you vulnerable online.

[h/t USA Today]

Is the true crime genre going anywhere? Probably not. Since Errol Morris’s The Thin Blue Line premiered in 1988 and helped free an innocent man accused of murder, filmmakers and viewers have developed a bottomless appetite for movies based on true stories that shed light on some of the darker sides of the human condition. Check out 11 of the best true crime documentaries you can stream right now on Netflix, Amazon Prime, Hulu, and other platforms.

1. The Seven Five (2014)

Crooked New York Police Department cops get a filmed perp walk in this examination of the city’s infamous 75^th precinct, which was a hive of corruption in the 1980s. Ringleader Michael Dowd talks about how taking money from drug dealers to offset his salary woes led to an increasingly complex and dangerous web of deceit.

Where to watch it: Netflix

2. Amanda Knox (2016)

College student Amanda Knox grabbed headlines in 2007 and beyond when her roommate, Meredith Kercher, was found dead in the apartment the two shared in Italy. What follows is a grueling path through an often-impenetrable Italian justice system.

Find It: Netflix

3. The Central Park Five (2013)

Director Ava DuVernay’s When They See Us limited series on Netflix has brought renewed attention to the Central Park Five case, which saw five minors wrongly convicted of attacking a jogger in New York’s Central Park in 1989. This feature documentary co-directed by Ken Burns, his daughter Sarah Burns, and her husband David McMahon examines the case, from the coerced confessions of the boys to their attempts to clear their names.

Find It: Amazon Prime

4. Long Shot (2017)

Though it’s more of a short film than a feature, this examination of Juan Catalan’s fight to be recognized as innocent of committing murder is notable for his attorney’s methodology: Catalan couldn’t have done it because he was at a baseball game. How they go about proving that turns into one of the biggest left-field twists you’re ever likely to see.

Find It: Netflix

5. Killing for Love (2016)

When married couple Derek and Nancy Haysom are found dead in their Virginia home in 1985, suspicion falls on their daughter, Elizabeth, and Elizabeth’s boyfriend, Jens Söring. Was Jens a co-conspirator, or just a pawn in Elizabeth’s game? Watch and find out.

Find It: Hulu

6. Dream/Killer (2015)

Bill Ferguson lived every parent's worst nightmare: In 2005, his son Ryan was sentenced to 40 years in prison for murder. But the elder Ferguson is convinced Ryan is innocent, setting off an unlikely chain of events that will test the foundation of the judicial system in America.

Find It: Netflix

7. Without Charity (2013)

In 2000, police discover a trio of construction workers have been murdered at an expensive home in Indiana. As police dig deeper, they discover the puzzling presence of Charity Payne, a woman who might have helped a group of robbers to break in and commit the murders.

Find It: Amazon Prime

8. Gringo: The Dangerous Life of John McAfee (2016)

Antivirus pioneer John McAfee reinvents himself in Belize, becoming an armed leader of a makeshift militia before later being implicated in the death of his neighbor.

Find It: Netflix

9. I Love You, Now Die (2019)

Teenagers in love Michelle Carter and Conrad Roy nourished their long-distance relationship via text messaging. But as Conrad’s mood grew darker, Michelle believed the best way to help her boyfriend would be to encourage him to take his own life. That dynamic sets the stage for a dramatic trial in Massachusetts that ponders the question of whether it's possible to be responsible for taking someone’s life via text.

Find It: HBO

10. Out of Thin Air (2017)

In 1974, two men in Iceland disappeared. A police investigation led to six men, who were all eventually sent to prison after confessing to murder. Decades later, new evidence casts doubt on their version of events—and whether they killed anyone at all. 

Find It: Netflix

11. Dead Man's Line (2017)

In July 1977, a man named Tony Kiritsis phoned police in Indianapolis and told them he was holding a hostage named Richard Hall at gunpoint. But this was no typical crime: Kiritsis had strapped his shotgun to Hall's neck with a dead man's switch that would set off the trigger if cops shot and killed him. Marching Hall out on the street, cops helpless to intervene, set off an astonishing chain of events. For Kiritsis, this dramatic display was personal, vengeful, and meant to be a spectacle, the result of a vendetta against the Hall family. What follows is a twist-laden and arresting portrait of a man who believes he's doing the wrong thing for the right reasons.

Find It: Amazon Prime