The thing is the police do not owe us any right for information on hereI understand your fustration but if someone is said to have a cast iron alibi then its not unreasonable to ask for details to corrobate that alibi. When those details are verified from source then they can be put aside.
The devil is in the detail in the CL case everything needs to be checked and double checked
Just my opinion
It would be great and a first if a properly identifiable source on here to speak on the cold case behalf.
You know ... keep us updated on a daily basis perhaps too much to ask because of data protection and other reasons .