This is a very tricky topic as a degree of confidentiality is an important element in open and honest reporting for flight safety purposes.
However, a blanket ban on using CVR/FDR readouts could lead to potential injustices. A few years ago I successfully defended an atpl holder on reckless endangerment charges where a single line from the FDR printout (My god it took ages to find it) confirmed everything the pilot said about the engine power parameters on the particular flight. The CAA did not believe his assertions and nor would the jury in all likelihood until presented with the evidence in black and white.