Police may rely on the injuries suffered by four adults to establish which one was driving the quad bike that crashed and left a 6-year-old girl fighting for her life.
Senior Sergeant Luke Shadbolt said police were still piecing together the circumstances behind the quad bike's crash on a country road at Waimarama Beach in Hawke's Bay last week.
Stephanie Lucas said she was the only adult on the bike who had not been drinking when it crashed and left her 6-year-old stepdaughter Ashlee Shorrock in a critical condition.
Ms Lucas, who claims she was not driving, said she had been pressured to take the fall for the crash because she was the only sober adult on board.
Ashlee's father, Daniel McGregor, and two other men, whose names have not been released, were also on the bike when it crashed.