According to 'goodasgold`s Post #6..." In the W.P.P. LE can fake an amber alert or even death....."
Here is some additional information regarding Canada's F.W.P.P.
Q: Is relocation with a name change the only option available to witnesses requiring protection?
A: No.
The FWPP is not an "all or nothing" program. The emergency provisions under Section 6(2) of the WPPA provide Witness Protection Coordinators the flexibility to provide a range of protective measures. When deemed appropriate, the use of immediate, short-term measures allow investigators and coordinators to respond quickly to potential threats. Emergency protective measures have been used in many cases where a witness either refuses protective measures or is deemed unsuitable for the FWPP.
http://www.rcmp-grc.gc.ca/fwpp-pfpt/qa-qr-eng.htm
As far as DG suing is concerned, can he do that when he's in jail for 2 counts of 1st degree murder? I have no idea? IMO, if I were the one signing on the dotted line to put such measure in place to convict a suspect for a crime like this, I, nor I doubt my superiors would have a big problem with that. JMO
IMO, LE should be able to hide someone (modified WPP) and charge the suspect with their fake murder (perhaps the 3rd one wasn't actually a murder, but was presented as having died due to neglect, etc) in order to solve the known murders. Perhaps the suspect gets scared about being accused of the 3rd and confesses to the first 2? The suspect wouldn't be 'convicted' of the faked murder, so why can't LE use this tactic to get the suspect to say that 'he had nothing to do with the murder of the child", in order to get a confession out of him for the 2 adults. There are various questioning techniques in interrogations; why not different techniques to catch a killer? Charges can be dropped.