Since authorities began keeping records in 1990, dozens of ____________ have been found along the Mexican border with the United States-24 were discovered in 2008.

Name: Since authorities began keeping records in 1990, dozens of ____________ have been found along the Mexican border with the United States-24 were discovered in 2008.
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Dope tunnels have been discovered along the Mexican border with the United States, with 24 found in 2008, indicating illegal activities such as drug smuggling.

Since Authorities Began Keeping Records in 1990, Dozens of ____________