U.S. Customs and Border Protection dog alerted authorities to the pills at the Yuma Sector immigration checkpoint in Arizona.
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The burritos stuffed with fentanyl were inside a backpack that a 37-year-old man was transporting in an SUV.
The drugs weighed more than 5 pounds and have a street value of nearly $60,000.
Officials arrested the man on Monday and seized the drugs.
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Fentanyl is of specific concern to law enforcement because it is a large component of the opioid crisis.
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This marks the second time in as many months officials have intercepted drug-laced breakfast food.
In February, federal agents in Cincinnati found nearly $3 million worth of Corn Flakes coated with cocaine heading for Hong Kong from South America.