11.   Defense lawyers have repeatedly accused prosecution scientists of contaminating the evidence by mishandling it, including failure to change gloves during collection and examinations.

12.   He told jurors the lab improperly stored the two socks in the same envelope and the evidence was contaminated.

13.   He told jurors the lab improperly stored the socks in the same envelope and the evidence was already contaminated when he got to it.

14.   In cross-examination, Blasier suggested that evidence was contaminated through poor packaging.

15.   Ito also rejected proposed defense instructions that would have told jurors to determine whether blood, fiber and hair evidence was contaminated before they can consider its relevance.

16.   Simpson also was wearing latex gloves last week to avoid contaminating the evidence.

17.   The defense contends, however, that sloppy police and lab work contaminated the evidence so badly that results from sophisticated DNA tests are meaningless.

18.   They also contend evidence was contaminated and tampered with by police.

19.   He was also expected to say the blood evidence was contaminated and used to frame Simpson.

20.   They tried to enter as evidence a news video showing police walking through blood at the crime scene which they said would have contaminated DNA evidence.