Sources that were with Whitney Houston the day that she died are reporting someone removed all traces of cocaine (that we now know was found in her system) from her hotel room before authorities arrived. Details below.

Marisa Mendez

The Coroner’s Office says Whitney used cocaine “immediately prior to her collapse.” Investigators who arrived on scene found no traces of cocaine or any other illegal substance.

One source who is extremely close to the situation tells us … the individual who removed the cocaine was also the person who supplied it to Whitney.

As we previously reported, other items were removed from the room as well, including bed sheets.

The Beverly Hills PD just told TMZ … its investigation is not closed. Cops will not comment on whether they are looking at evidence tampering.