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People vs. Dr. Conrad Murray

Big Problem

With MJ Surveillance Tape

10/24/2011 12:15 PM PDT BY TMZ STAFF

Surveillance Specialist -- Alex Supall Testifies
Updated 10/24/11 at 11:21 AM
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Lawyers for Dr. Conrad Murray are insinuating ... the LAPD did a sloppy job retrieving evidence from Michael Jackson's surveillance cameras the day the singer died -- failing to make copies of crucial footage before it was erased.

The defense's second witness -- a surveillance specialist for the LAPD named Alex Supall -- just testified, he only handed over a few minutes of surveillance footage to investigators, showing MJ arriving home for the last time at around 12:45AM on June 25th, 2009.

As TMZ first reported, Murray's lawyers have had a big problem with how investigators only recorded a small fraction of surveillance footage from that day -- and demanded to see the entire 24-hour tape.

Specifically, Murray's lawyers want to see who entered MJ's house during that period -- footage that could prove their theory that evidence in the house was tampered with.

Problem is ... the cameras run on a 24-hour loop -- so, Supall testified, if the footage hasn't been transferred ... it's replaced with new footage and cannot be retrieved.

Supall said he only copied those few minutes to establish a timeline of when the singer returned home after his last rehearsal on June 24 -- everything else is gone forever.

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