A study tried to find out if smoking weed or drinking alcohol makes people more likely to crash their cars. They looked at many drivers who were in accidents or went to the hospital for help. They found that only when people drank alcohol and maybe used weed too, they had a higher chance of crashing. If someone just smoked weed, it didn't make them more likely to crash their car. So, this study says that laws about driving after using drugs should focus more on drinking alcohol than smoking weed. Read from source...

1. The study is flawed because it only focuses on injured drivers and non-injured drivers seeking medical care, ignoring the majority of drivers who did not crash or seek help. This skews the results and does not represent the overall population of cannabis and alcohol users.
2. The research methodology is weak because it relies on self-reported substance use and blood samples taken after the incident, which may not accurately reflect the drivers' actual level of impairment at the time of driving.
3. The study's findings are contradictory, as they claim that cannabis use alone does not elevate the odds of MVCs, but also state that alcohol consumption alone or in combination with cannabis significantly heightens the likelihood of crashes. This creates confusion and inconsistency in the message.
4. The policy implications are based on weak evidence and do not consider the potential risks of legalizing cannabis for driving, such as increased availability and use among younger drivers or the lack of a reliable roadside test to detect cannabis impairment.
5. The call for nuanced DUI laws is unrealistic, as it would be challenging to implement and enforce such policies in practice, given the complexity of assessing actual driving impairment and clinical signs of intoxication on a case-by-case basis.