When Raymond and Nick arrested Finn, in the flashback retelling of the crime Sasha is wearing white sneakers. In the next shot Sasha has high heeled stiletto shoes on as she falls down the stairs.
Not only would a CSI not be on a stakeout, a CSI would never be the first to enter a clandestine drug lab. The HazMat team would be the first to enter and stabilize the lab. Any person not certified in hazardous materials handling that enters an area containing a clandestine drug lab would cause the entire department to be subjected to severe fines and penalties by the EPA. This is due to the highly toxic and extremely unstable chemicals in use.