Zimmerman Trial question

While researching the Zimmerman trial I came across this: http://ift.tt/1rJtggO

Quote:

Di Maio said he concluded: • DNA and other evidence from Trayvon’s hooded sweatshirt may have been compromised because crime-scene technicians improperly stored Trayvon’s wet clothes in plastic bags. Wet evidence should be allowed to dry out and be packaged in paper bags that allow it to “breathe,” Di Maio said.

Is this true?