Over two hours, federal agents snapped pictures as the pair visited seven banks, stopping at each one to make cash deposits of just under $10,000 — all from piles of drug money stashed in their bags. Prosecutors say the flurry of modest deposits was one of the many schemes hatched by Mexican crime cartels trying to bring billions of dollars in drug proceeds back from the United States without attracting scrutiny from banking regulators. Agents began watching her in New York after her name came up in an investigation of money-laundering cells in southern California, Michigan and Arizona being conducted by investigators from the DEA Drug Enforcement Task Force, Department of Homeland Security, the IRS and local agencies.