It's a little unusual but not unheard of. If they have a legitimate reason for doing so (e.g.: they are working on a similar case or cases and they wish to compare the two crimes with one another). So long as the chain of custody is thoroughly documented and not broken the evidence remains un-tainted.
Alright... a little clarification, since I found someone who actually is a Lt. Detective in Homicide for the SFPD. Barring the case you just mentioned, where they are working on a similar case, it is (according to him) almost impossible to check out evidence unless you have been assigned to the case. But thank you for the answer! :)
The New Detectives Case Studies in Forensic Science - 1996 Critical Evidence 9-16 was released on: USA: 2005
The Answer is EVIDENCE! I know that but the other kid doesn't!
If a case goes cold, there isn't enough evidence to form or support theories. Cold case detectives dig into those cases to attempt to find more evidence. ~{Insomniac Platypus}~
In most jurisdictions the case is assigned to a detective, known as the lead detective for that case. That detective will manage the case according to his needs and the priority in which that crime must be solved. Detectives normally work by shift, but maybe called in on a homicide case, on a case-by-case basis. The detective Lieut. will assign the case to a lead detective, who will delegate certain tasks of the case to other detectives (for example, the lead detective may interview witnesses while another detective may notify the family or assist in processing the crime scene).
Of course most detectives want to solve their case and get punishment for the guilty. If an innocent person is unjustly accused it's up to the detectives to find the evidence that will set the wrongly accused free.
To investigate all leads, all witnesses, and all evidence in the case that is assigned to them in an effort to make an arrest - close the case, and bring the perpetrator to justice.
Forensic Files - 2000 DNA Dragnet 13-3 was released on: USA: 15 May 2009
After a preliminary hearing, a judge may send your case to trial if there is sufficient evidence to proceed. Alternatively, if the evidence is weak, the case may be dismissed. In some instances, the judge could also refer the case to a grand jury for further review and potential indictment.
Discovery
Detectives can employ various strategies to get information from someone they know is withholding it. They may conduct interviews, gather evidence, and build a strong case against the suspect. They could also use psychological tactics, such as persuasion or playing on the suspect's emotions, to encourage them to divulge the information. In some cases, detectives may even consider offering incentives or plea deals to elicit cooperation.
The New Detectives Case Studies in Forensic Science - 1996 is rated/received certificates of: Australia:M USA:TV-PG
The New Detectives Case Studies in Forensic Science - 1996 Acquittal was released on: USA: 22 March 2002