Police had been focusing most of their attention on fields and wooded areas, but on Monday the search for Victoria Stafford's body entered a new phase.

Two lakes in the Guelph area were being searched with sonar technology that sends an acoustic signal into the water, generating a computer image.  If anything suspicious is noted, divers will be sent in to further investigate.  So far, that hasn't happened.

"We haven't found anything on this pass," admitted John Edwards of the Under Water Search and Rescue Unit.  "We were just told to come and search the lake, so I don't know what their reasoning was."

Monday marked the first day that 18-year-old Terri-Lynne McClintic didn't accompany police on the search.  She's charged with abduction in the case, as well as being an accessory to murder.  Her boyfriend, 28-year-old Michael Rafferty, is facing first degree murder charges.

"The search continues to remain in the Wellington area, I have no further description where in the Wellington area, but investigators continue to follow the evidence where it leads them and they are leaving no stone unturned," said  Oxford Police P.C. Laurie-Anne Maitland.

In the meantime investigators wouldn't confirm or deny rumours that the backseat to a suspect vehicle had been found and sent for forensic testing.