WAREHAM — Police say a Massachusetts woman crashed her car overdosing on heroin while her 3-year-old son was in the back seat.Authorities found the woman in Wareham Friday afternoon after her car struck some bushes and a snow bank. Police say the 34-year-old was slumped over the steering wheel, and she had to be revived with the opioid reversal drug naloxone.The child was unharmed.