 In 1995, he became a member of the DNA subcommittee for the State of New York, and during the 1995-2000 period, Chakraborty served as a member of the US government National DNA Advisory Board.In both cases, Chakraborty helped develop policies on the use of DNA and approved the methodologies and statistical tools in identification procedures.In 1995, Chakraborty and Dan Hartl testified for the prosecution in the O. J. Simpson murder case.