The defendant was not entitled to a new trial on grounds that the SBI Crime Lab refused to test four hair and fiber lifts taken from an item of clothing. The defendant did not argue that the prosecutor failed to make the lifts available to him for testing. In fact, one of the defendant’s previous attorneys made a motion for independent testing of the clothing item and received the results of the testing. Because police do not have a constitutional duty to perform particular tests on crime scene evidence, no error occurred.