Lawyers for D.C. Mayor Marion Barry have retained a consultant who is an expert in interpreting body language to help pick jurors thought to be favorable to Barry in his drug trial.

Glenn R. Berlin, of Silver Spring, has given defense lawyers R. Kenneth Mundy and Robert W. Mance a ward-by-ward analysis of demographic data in the District that he says will establish a profile of the "ideal juror," and help cull the pool of 250 prospective jurors to select "the type of person who would be most receptive to the defense."

Citing confidentiality, Berlin would not describe the "ideal juror profile," except to say it is based on a correlation of political polling results and District census data on age, sex, race, income, education and housing.

"Basically, what I did was a numbers crunch," said Berlin, 41. "No crystal ball, no intuition."

Most prospective jurors in the District, drawn from voter registration and driver's license lists, are black, and many are government employees and homeowners.

Veteran lawyers say they tend to be anti-drug and pro-police.

Many lawyers interviewed have said the Barry defense would do best to choose an all-black jury and pursue defense strategies essentially putting the government on trial, claiming that federal investigators improperly hounded Barry for years.

Berlin said his analysis meshes census information with recent polls dealing with "perceptions of the mayor."

As a hypothetical, he said, "If a poll indicates that single black females between the ages of 18 and 30 view the mayor favorably, then I would . . . determine which wards the single black females in that age bracket are concentrated in."

The list of prospective jurors includes their street addresses, he said, "so you can make a convincing argument that {single black females between 18 and 30} with addresses in those wards may be appropriate to select . . . . It would be one check mark in favor of keeping them" on the jury.

Berlin, an exuberant man who calls lawyers to offer his services after reading news accounts of court cases, said he wrote Barry's lawyers in February shortly after the mayor's first indictment.

He said that he offered a range of services, but that because of financial constraints his contract was limited to creating the ideal juror profile. Mundy and Mance declined to discuss the contract.

Berlin said he became interested in nonverbal communication after seeing a $1.50 book on body language at an airport. A longtime commercial sales technique instructor, Berlin taught himself about body language and jury selection.

He is part of a growing legion of specialists -- estimated at more than 200 nationwide -- who assist lawyers in complex cases.

Interpreting body language, or nonverbal communication, is Berlin's specialty. "Ninety-three percent of all communication," he said, "is nonverbal: intonation, pitch, inflection, touch, eye contact, posture, gestures."

Berlin also runs Berlin Training and Development in Silver Spring.

He has taught body language interpretation to salespeople, listening skills to car dealers, interrogation methods to Secret Service agents and hostage-situation training to the Prince George's County police.

He would not reveal his fee in the Barry case. Richard J. Crawford, a founder of the American Society of Trial Consultants, said consultants receive anywhere from $50 to $250 an hour, most in the $80 to $100 an hour range.