📄 Direct examination of Gregory Matheson (part 3) — Thursday, May 4, 1995
Address:
C:\DEPT103\CRIMINAL\1995\MAY\4\DIRECT-EXAMINATION-OF-GREGORY-.DOC
TRIAL
▲ Day 67 of 167

Direct examination of Gregory Matheson (part 3)

Witness: Gregory Matheson
Examiner: Hank Goldberg
Called by: Prosecution • Date: Thursday, May 4, 1995 • Utterances: 53
Goldberg conducts redirect examination of LAPD criminalist Gregory Matheson, rehabilitating the lab's security protocols after defense cross-examination raised contamination concerns. Matheson explains that chemicals stored in the drying cabinet cannot alter blood type evidence, and that access to the evidence processing room is tightly restricted — ordinary detectives and police officers cannot enter, and janitors are supervised when they do.
1 THE COURT:

All right. Thank you, counsel. And Mr. Goldberg, did you collect those two items? All right. Miss Martinez indicates yes. All right. Let's proceed. Proceed.

2 MR. GOLDBERG:

Thank you.

3 MR. GOLDBERG:

Mr. Matheson, are you aware that the items 84-A and 84-B were in fact sent out for DNA testing and came back with a result consistent with Nicole Brown?

4 MR. MATHESON:

It is my understanding, yes.

5 MR. BLASIER:

Objection, no foundation.

6 THE COURT:

Sustained. It is hearsay.

7 MR. GOLDBERG:

All right.

8 THE COURT:

Well, I assume we will get to that later.

9 MR. GOLDBERG:

Now, Mr. Matheson, you were asked about some questions regarding security at the Scientific Investigations Division, and specifically the evidence processing unit. Now, is the evidence processing unit where evidence is brought when someone is coming back from the scene of a crime and you have biological evidence that needs to be dried?

10 MR. MATHESON:

Actually, the evidence processing room--room is the room in the laboratory where all evidence is brought back do when it is collected in the field.

11 MR. GOLDBERG:

And do you have--is that where you would dry biological evidence?

12 MR. MATHESON:

Yes, it is.

13 MR. GOLDBERG:

And with respect to all of the cases where LAPD has collected biological evidence through the crime lab, is that the room that is used?

14 MR. MATHESON:

Yes, it is.

15 MR. GOLDBERG:

Now, you were asked about a cabinet in that room that is used for drying purposes. Do you recall that?

16 MR. MATHESON:

Yes, I do.

17 MR. GOLDBERG:

In that cabinet there are some chemicals that are stored?

18 MR. MATHESON:

That's correct.

19 MR. GOLDBERG:

Are the chemicals stored in that cabinet--can they--do they come into contact with the items that are placed in the cabinet for drying?

20 MR. MATHESON:

No, they do not.

21 MR. GOLDBERG:

And if they did, what would happen?

22 (No audible response.)
23 MR. GOLDBERG:

The type of reagents that you store?

24 MR. MATHESON:

The reagents that are stored in there are kits that are prepared to do blood testing in the field and if for some reason they were to come in contact with any of the evidence samples, it would degrade the sample so that you would not be able to get a typing result.

KEY QUOTE
25 MR. GOLDBERG:

It would not result in the type of the sample changing from one type to another or changing from someone's blood into someone else's blood?

26 MR. MATHESON:

No, it would not.

27 MR. GOLDBERG:

Now, directing your attention to the photo tour board, the front door that is depicted in the outdoor photograph, it is photograph no. 30 on the right-hand side. You say anyone during working hours can go through that door?

28 MR. MATHESON:

That's correct. It is kept unlocked.

29 MR. GOLDBERG:

And what about during hours when the laboratory is closed?

30 MR. MATHESON:

It is locked.

31 MR. GOLDBERG:

Can people get through--anyone get through that door?

32 MR. MATHESON:

No. Only people that have the access card.

33 MR. GOLDBERG:

And who are they?

34 MR. MATHESON:

Well, that would be the criminalists, the couriers that I mentioned, the personnel that work there, and there are certain ones of those that are limited in their access, depending on the day of the week and the hour of the day, but most of the personnel that work there have access.

35 MR. GOLDBERG:

Now, with respect to getting through the card key area into the corridor, the photo that says "entry corridor," on this exhibit, the photograph that is two down from the top on the right-hand side and in the left column, who can get into that area?

36 MR. MATHESON:

Talking about the door from the crime lab lobby into the hallway?

37 MR. GOLDBERG:

Right.

38 MR. MATHESON:

Again, it would have to be people that have access cards that have been approved to go through this door at a particular time of day. All the employees of that location can do that during normal working hours. After normal working hours it is more limited to the criminalists and the couriers and--unless under special circumstances we could occasionally change the access for like administrative staff, the secretaries.

39 MR. GOLDBERG:

But ordinary detectives or police officers, do they have access to the corridor area?

40 MR. MATHESON:

No, they do not.

41 MR. GOLDBERG:

Now, with respect to the evidence processing room, does everyone who has access to the corridor areas of the lab also have access to the evidence processing room?

42 MR. MATHESON:

No, they don't.

43 MR. GOLDBERG:

Okay. Who has access to the corridors that does not have access to the evidence processing room?

44 MR. MATHESON:

That would be our clerical staff. We have a store keeper that does our ordering and maintenance of the stock room. I don't believe our evidence control unit personnel do. I would have to check that for sure.

45 MR. GOLDBERG:

Now, you said that--you were asked about janitors. Do they have access to the evidence processing room?

46 MR. MATHESON:

No, they do not.

47 MR. GOLDBERG:

Do they ever go into the evidence processing room?

48 MR. MATHESON:

Occasionally, yes.

49 MR. GOLDBERG:

Under what conditions?

50 MR. MATHESON:

They would knock on the door and if somebody is inside, that person would allow them into either sweep or mop the floors and empty the trash cans.

51 MR. GOLDBERG:

So the janitors are then monitored by one of the people that has access, such as a criminalist or one of your student workers?

52 MR. MATHESON:

That's correct.

53 THE COURT:

All right. Mr. Goldberg, we are going to have to take our break at this point. Ladies and gentlemen, please remember all my admonitions to you. We will take a recess for about fifteen minutes. Mr. Matheson, you can step down. All right. 15.

Temperature

procedural

Key Quotes (3)

Gregory Matheson
The reagents that are stored in there are kits that are prepared to do blood testing in the field and if for some reason they were to come in contact with any of the evidence samples, it would degrade the sample so that you would not be able to get a typing result.
Directly rebuts any defense implication that lab chemicals could alter or contaminate blood evidence in a way that changes whose blood appears on a sample.
Gregory Matheson
No, it would not.
Matheson flatly denies that chemical exposure could change a sample from one blood type to another — a key defense contamination theory.
Gregory Matheson
No, they do not.
Confirms that ordinary detectives and police officers cannot access the corridor area of the crime lab, countering any suggestion of unauthorized police entry.

Evidence (2)

Informal
Photo tour board of the LAPD Scientific Investigations Division / crime lab, including exterior front door (photo 30) and entry corridor photographs
discussed
Informal
Items 84-A and 84-B — biological evidence sent for DNA testing with result consistent with Nicole Brown
referenced (excluded as hearsay)

Notable Exchanges (2)

Hank GoldbergGregory Matheson
Goldberg methodically walks Matheson through each layer of access control — exterior door, corridor, evidence processing room — establishing that police officers, detectives, and even most clerical staff cannot access the evidence processing room unsupervised.
strategic
Robert BlasierLance A. Ito
Blasier objects to Goldberg's attempt to elicit Matheson's knowledge of DNA results from items 84-A and 84-B. Ito sustains on hearsay grounds but signals the matter will likely be addressed through a proper witness later.
procedural

Witness Demeanor

(No audible response.) — Matheson pauses before answering what would happen if reagents contacted evidence samples

Objections

1 objections (1 sustained, 0 overruled)
Proceeding 5929 • 53 utterances • Prosecution witness
Criminal Trial
Department 103
⚖️ Start
📂 MAY 4, 1995 📄 Direct examination of Gregory
MAY 4, 1995 KRT DvH TD