-LRB- CNN -RRB- -- In a messy drug bust this week , investigators uncovered more than 700 pounds of marijuana stuffed in a septic tank truck full of human waste , Arizona police said Friday . And the search of the truck was as awful as it sounds . `` Yeah , that really does suck , '' Arizona Department of Public Safety spokesman Bart Graves told CNN . `` It 's a long way to go to make a bust . '' Hidden in the holding tank of the truck were 743 pounds of pot , worth about $ 409,000 on the street , police said in a news release . An officer pulled over the septic tank truck Wednesday after a check of the license showed it was invalid , police said . The truck was headed northbound on I-19 and stopped about 35 miles south of Tucson , Arizona . Police patrolling the area tend to be more vigilant , Graves said , because the interstate -- which leads directly to Mexico -- is a major thoroughfare for drug and human trafficking . After the stop , the officer discovered that the commercial vehicle markings on the truck were also invalid . A subsequent search revealed the bales of marijuana in red and orange packages amid the waste . `` It just shows how desperate these drug cartels are , '' Graves said . `` They 'll go to any lengths to conceal their product . We 've seen it concealed -LSB- among -RSB- watermelons , bell peppers . This is the first time we 've seen it concealed in human waste . '' Police arrested the driver , Leonard Salcido , 24 , of Tucson , and charged him with possession of marijuana , possession of marijuana for sale and transportation of marijuana , police said . The bust was not the largest for Arizona police . In 2008 , police found more than 2,000 pounds of marijuana in a fake UPS truck , Graves said . Wednesday 's smelly pot was just one major bust this week . On Thursday , police confiscated $ 681,000 worth of methamphetamine concealed in the false floor of a vehicle . The driver was stopped for speeding on I-17 near Camp Verde , Arizona , police said . The officer asked to search the vehicle and found 15 pounds of meth , police said .