rattling sound from rear on 2004 BMW 330Ci

how do i know if a shock is bad

3 answers
possible that other item(s) is rattling...shocks rarely rattle.
Under what conditions does the rattle occur? Going over bumps? On turns? What speed(s) is it most likely?Will it rattle when sitting still , with someone pushing up&down on any particular corner? Is Cap'n Crunch really better than King Vitamin?
rack up the car or jack it up and look at shock bushings and grab shock and wiggle to see if its loose