A Secret Service agent described today how he and other agents last winter followed a District cabdriver who was carrying $10,000 in illicitly obtained food stamps through Washington until he finally ended up at the suburban home of Maryland state Sen. Tommie Broadwater Jr.

"He entered the home carrying the bag of food stamps ," testified Agent James Lucey in a hushed federal courtroom here. The residence, he said, was 3309 Hayes St., Glenarden, in Prince George's County. A car parked in the driveway bore the license designation "Maryland senator 25," he said. Both house and car belonged to Broadwater, Lucey added.

Thus, federal prosecutors contended, they established the first of several conspiratorial links between Broadwater, a longtime Prince George's County political and business figure, and a group of stolen food stamp traffickers using a defunct funeral home in Washington as a front.

Broadwater, 41, his daughter, Jacqueline, 21, and three Washington area men are charged with conspiring to obtain $70,000 in purportedly stolen food stamps furnished by an undercover Secret Service agent posing as a food stamp thief.

Broadwater is accused of processing the stamps through his Chapel Oaks Farmers Market in Fairmount Heights and attempting to redeem them from the government for their full cash value.

Broadwater was motivated by the need to save his faltering business from bankruptcy, according to a statement by prosecutor James P. Ulwick.

The delivery of $10,000 in food stamps to Broadwater described by Lucey today was the first of four deliveries by accused bagman William Dudley, 49, of Landover, between Jan. 20 and March 6 this year, according to Ulwick.

Dudley, Ulwick told the jury, transported two of the four shipments in his Yellow Cab to Broadwater from the Malvan & Schey funeral home at 424 R St. NW.

There, Ulwick said, funeral home owner Raymond (Big Jack) Quigley Sr., 68, and his son, Raymond Jr., 49, had negotiated the sale of marked food stamps at "discounted" prices from undercover Secret Service agent Norman James.

While Ulwick attempted to establish the link between Broadwater and the other defendants today, the prosecution against Raymond Quigley Sr. appeared at least temporarily damaged.

Undercover agent James, answering rapid-fire questions from Quigley's attorney, Gene Johnson, acknowledged that the elder Quigley made no cash payments to James for food stamps.

"He never, ever gave you one dime for stamps, isn't that right?" said Johnson. "That is true," said James.

Quigley did accept $1,015 in "free" food stamps from James at the funeral home, Johnson acknowledged, but wasn't that because Quigley was a "talkative, kindly old fellow?"

No, answered James, who added that Quigley told him he would "bust me over the head" if James didn't turn over the stamps. James said a funeral home employe also once pulled a gun on him. "A funeral home's not a great place to be in," James said.

While James acknowledged Quigley Sr. made no direct payments for food stamps, prosecutors contend that as owner of the funeral home, Quigley helped arrange meetings among James, Dudley and Quigley Jr. and was thus part of the conspiracy.

Dudley and Quigley Jr. both contend they were illegally entrapped by James. Broadwater is expected to acknowledge having contact with Dudley but without criminal intent.