Federal prosecutors concluded their presentation of evidence yesterday against Leon Durwood Harvey, who has been charged with racketeering and running a criminal enterprise that allegedly smuggled $36 million worth of marijuana and hashish into the United States over eight years.

Twelve of the government's 17 witnesses were identified as former associates or acquaintances of Harvey who have pleaded guilty to drug-related charges or been given immunity from prosecution for their testimony in U.S. District Court in Alexandria.

The others were a real estate agent, a car salesman, two accountants and an Internal Revenue Service agent who said Harvey purchased a $240,000 home in Alexandria and a BMW with cash and failed to report taxable income to the IRS.

Steven Ravenel testified that he helped Harvey import about 45,000 pounds of marijuana from Colombia into the United States and as payment received $800,000 in cash in two suitcases from Harvey in Alexandria's Old Town.

Harvey's attorney, John Zwerling, asked U.S. District Court Judge Albert V. Bryan Jr. to dismiss several charges in his client's 25-count indictment, saying the government had not proved the charges, but Bryan denied the motion. Harvey, 37, also is accused of tax and customs laws violations, obstruction of justice, money laundering and distribution of drugs. His trial is scheduled to resume this afternoon.