Floyd's pusher will be on the stand tomorrow. The prosecution does not want him to testify, and did not give him immunity and so he wants to plead the 5th. They claim he is an unreliable witness and so therefore does not meet the standard, or something like that. Well, most of the defences witnesses will be contradicting the prosecutions witnesses, so what about that aye?!
Essentially, it is likely that the pushers testimony is likely to damage the prosecutions case. He was with Floyd all day, I believe, and so telling the jury he was difficult to rouse from sleep in the car suggests a high level of drug usage. Plus the woman who said she phoned to get someone else to take her home because of the difficulty they were having with Floyd asleep at the wheel.