Mr. Redlich. Could you, for the sake of the record, give me a few examples of the types of situations in which it has been used—without reference to any particular case?
Mr. Gallagher. Neutron activation analysis has been used to determine the arsenic content in hair, urine, and fingernail scrapings, in a suspected arsenic-poisoning case.
Mr. Redlich. Has it been—is it used as a method of determining whether or not a person has fired a weapon?
Mr. Gallagher. I do know that this technique has been used to attempt to determine if an individual has fired a weapon.
Mr. Redlich. Do you believe that it is a technique which could be used under certain conditions to determine whether or not a person has fired a weapon?
Mr. Gallagher. I do believe that it is a technique which can be used to determined if a person has fired a weapon or handled a recently fired weapon.
Mr. Redlich. Have you yourself, Mr. Gallagher, ever testified in court with regard to the results of a neutron activation analysis?
Mr. Gallagher. No, sir.
Mr. Redlich. Now let us turn, Mr. Gallagher, to the specific investigation that we are concerned with in this inquiry. Are you familiar with any neutron activation analyses which were conducted in connection with the assassination of President Kennedy?
Mr. Gallagher. Yes, sir.