PHARR, TX (KTRK) -- It appears produce is a common item used in drug smuggling these days.Homeland Security is investigating after U.S. Customs and Border Protection found drugs hidden in what appeared to be limes.Agents found nearly 4,000 pounds of marijuana inside fake limes, hidden with real limes. The smuggled drugs were discovered in a tractor trailer headed into the U.S. from Mexico on Jan. 30.Officers used a non-intrusive imaging system, along with the help of a canine team to locate the drugs.The street value is estimated at nearly $800,000. Carrots were also used in an attempted drug smuggling in Pharr. ABC13 reported on Jan. 14 that officers discovered 2,500 pounds of pot in shipment of the orange vegetable.