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LAPD police check drivers at a DUI checkpoint in Reseda, Los Angeles, California on April 13, 2018.
Pot may be legal in eight US states and the capital, but tokers getting behind the wheel on a national weed appreciation day could be in for a downer as police forces crack down on intoxicated drivers. In places like California, where recreational marijuana has been legal since January, law enforcement officials and doctors are worried about an increase in people arrested for erratic driving and hospitalized with overdoses. The issue is particularly acute on April 20, or 4/20, a national day of celebration in cannabis culture -- especially after 4:20 pm when usage surges.

/ AFP PHOTO / Mark RalstonMARK RALSTON/AFP/Getty Images

How will Massachusetts deal with marijuana-impaired driving?

Massachusetts home getting struck by mystery arrows

Bezos, Buffett, Dimon health venture will be based in Boston

New England Patriots Rob Gronkowski had his home broken into, while he was away at the Super Bowl.

Man charged with robbing Gronkowski's home arraigned June 21, 2018 | 9:55 AM

Intel CEO out after consensual relationship with employee June 21, 2018 | 9:43 AM

AP-NORC Poll: Americans not hopeful about ties with allies June 21, 2018 | 9:06 AM

Lake Champlain

2 Vermont beaches closed due to E. coli bacteria June 21, 2018 | 9:06 AM

The Latest: Trump creates uncertainty about border bills June 21, 2018 | 9:03 AM

koko

Koko, the gorilla who knew sign language, dies at 46 June 21, 2018 | 8:48 AM

AP-NORC Poll: Majority approve of Trump's North Korea effort June 21, 2018 | 8:02 AM

Tariffs stir unrest among American whiskey producers June 21, 2018 | 7:29 AM

map westfield river russell

Body of missing child found in western Massachusetts river June 21, 2018 | 7:15 AM

tolland state forest

Man ordered held on $1 million bail for daughter's death June 21, 2018 | 1:02 AM

Trump's migrant policy: First blowback, then about-face June 21, 2018 | 12:54 AM

Young immigrants detained in Virginia center allege abuse June 21, 2018 | 12:38 AM

'Great job,' says Trump: Nielsen back in good graces for now June 21, 2018 | 12:36 AM

Trump tweet complicates House GOP efforts on immigration June 21, 2018 | 12:34 AM

Young immigrants detained in Virginia center allege abuse June 21, 2018 | 12:33 AM

Trump's migrant policy: First blowback, then about-face June 21, 2018 | 12:17 AM

Silent no more, Ivanka Trump thanks father for border action June 21, 2018 | 12:14 AM

AP FACT CHECK: Trump overstates order on family separation June 21, 2018 | 12:13 AM

Police identify man fatally shot in Lowell June 20, 2018 | 10:00 PM

AP FACT CHECK: Trump overstates order on family separation June 20, 2018 | 7:36 PM

Georgetown, MA: June 21, 2017: At Great Rock Farm, goats are incorporated into the yoga class that is held outdoors under trees and next to a pond. Here Elizabeth Shorter of Amesbury plays with two goats.

Video: Watch goat yoga on the Greenway June 20, 2018 | 5:51 PM

Police: Teen leads troopers on chase, crashes into pole in Foxborough June 20, 2018 | 5:22 PM

Report finds industrial chemicals more toxic than thought June 20, 2018 | 5:14 PM

MBTA repairman charged with stealing $80,000 from agency’s fare box system June 20, 2018 | 4:43 PM

Trump meets with lawmakers about ZTE deal opposed in Senate June 20, 2018 | 4:43 PM

Nielsen's career forever linked to family border separations June 20, 2018 | 4:25 PM

Marshfield, MA - 3/02/2018 - A flooded neighborhood near Rexhamme beach in Marshfield after a Nor'easter pummeled coastal areas in Massachusetts. - (Barry Chin/Globe Staff), Section: Metro, Reporter: Globe Staff, Topic: 03storm, LOID: 8.4.1159877283.

These 5 Mass. towns could be the most at risk from rising seas June 20, 2018 | 4:21 PM

GOP senator defends EPA chief, calls ethics allegations lies June 20, 2018 | 4:16 PM

Trump postpones Thursday's annual congressional picnic June 20, 2018 | 4:11 PM

UMass Amherst students head across campus

Ex-student dies in fall from 16th floor of UMass building June 20, 2018 | 2:58 PM