premise: British police were expected Monday to stage a reconstruction of the last known movements of a serial killer's victims, as they seek a breakthrough over the murders of five young prostitutes.
  Detectives are also offering an amnesty for drug dealers in the quiet English town of Ipswich, in a bid to persuade them to provide information that could help in the unprecedented manhunt.
  Their bodies were all found naked in countryside on the outskirts of Ipswich, 80 miles (130 kilometres) north-east of London, more than 10 days ago, sparking fears that a serial killer is on the loose.
  None showed signs of having been subjected to significant trauma or serious sexual assault, fueling speculation that the killer might have been a drug dealer who doped them.
  All five women were drug users and police have now offered the amnesty to local dealers in the hope that they will come forward with new information, the Times newspaper quoted the officer leading the probe as saying.
   What does the police hope might happen after they offered amnesty to local dealers?
hypothesis: Detectives are also offering an amnesty for drug dealers