Mr. Stombaugh.

So, therefore, it would not be possible to estimate the number of different people whose hairs have appeared on this blanket.

Mr. Eisenberg.

Now, Mr. Stombaugh, are you able to say that the limb hairs and pubic hairs which you found in the blanket and which you have matched with Oswald's in observable microscopic characteristics came from Oswald to the exclusion of any other individual?

Mr. Stombaugh.

No; I couldn't say that. I could say that these hairs could have come from Oswald. I could not say they definitely came from him to the exclusion of all other Caucasian persons in the world.
In order to say this, one would have to take hair samples from all of these people and compare them and this, of course, is impossible.

Mr. Eisenberg.

What degree of probability do you think there is that these hairs came from Oswald? And without putting a precise number on it, let's suppose you took head hairs from 100 Caucasion individuals, how many matches would you expect to find among those hundred different hairs on the basis of your experience?

Mr. Stombaugh.

On the basis of my experience I would expect to find only one match.

Mr. Eisenberg.

That is to say that the 100 hairs would be different from each other?

Mr. Stombaugh.

Yes, sir.

Mr. Eisenberg.

Is your experience, therefore, that the hairs of different individuals do not match in observable microscopic characteristics--within the basis of your experience?

Mr. Stombaugh.

Within the basis of my experience, I have examined thousands of hairs and I have never found Caucasian hairs from two different individuals that match.

Mr. Eisenberg.

Now, when you say that, Mr. Stombaugh, have you been presented with hairs in your laboratory from Caucasian individuals which you knew before the examination came from two or more individuals?

Mr. Stombaugh.

Yes.
We have obtained samples of hairs from a hundred different people, and would select one hair, give it to an examiner and ask who it originated from, and invariably he would be able to find in the hundred different samples the individual the hair originated from.

Mr. Eisenberg.

Now, when a specimen comes into your laboratory, does it frequently come in--and I am talking now .about specimens that come in from a crime does it frequently come in such, so that you have two specimens, two or more specimens, which you know before you begin. are from two different people?

Mr. Stombaugh.

Yes.

Mr. Eisenberg.

You are told before you begin that they come from two different people?

Mr. Stombaugh.

Yes, sir; ordinarily a case such as a murder or a rape, you will obtain the clothing of the victim, the clothing of the suspect in the case, as well as hair samples from the victim and hair samples from the suspect.

Mr. Eisenberg.

How many types of cases like this do you think you have processed?

Mr. Stombaugh.

Processed approximately 500 a year.

Mr. Eisenberg.

For how many years?

Mr. Stombaugh.

Four years--no, three years.

Mr. Eisenberg.

In any of these approximately 1,500 cases, have you found a case involving Caucasian hairs in which the hairs from the known two different individuals matched in observable physical characteristics microscopically?

Mr. Stombaugh.

No, sir; I have never found hair from two different Caucasian persons that matched.

Mr. Eisenberg.

Have you found any in non-Caucasian hairs, by the way?

Mr. Stombaugh.

I have found several cases in which hairs from two different persons of the Negroid race, although the hairs did not match completely, the characteristics were such that I felt that I could not go further with the examination because I could not exclude the hairs. The hairs were too similar. When