YES, several times, and again at the end. Dusek tried to prove it only meant the body was there AT LEAST from the 16th, but could have been before.
Feldman went on to show , because of lack of beetle grubs, and that the fly larvae were first generation, that the body was 99.9% positively not there before the 16th.
Dusek recrossed and recrossed, trying to prove variations in weather, rainfall ,etc. could affect the calculations, but it didn't make enough of a difference to matter. ANSWER WAS, the BODY WASN'T THERE UNTIL THE 16th. IF it was covered, as DUSEK tried to prove, IT WOULD HAVE HAD TO HAVE BEEN SEALED IN PLASTIC to have made a difference. THE POLICE at the SCENE stated there was NO INDICATION the body had been WRAPPED in ANYTHING. So Dusek, lost that one too.