Final answer:
To obtain a search warrant, the investigators need to establish probable cause based on the passerby's suspicious knowledge about the bomb materials and attempt to flee. The Fourth Amendment protects individuals from unreasonable searches, but there are exceptions where a warrant may not be necessary. The investigators can present their evidence to a judge and request a search warrant if they can demonstrate a reasonable expectation of finding evidence.
Step-by-step explanation:
In order for the investigators to obtain a search warrant, they need to establish probable cause. Probable cause refers to the belief that a crime has been committed or that evidence of a crime can be found in a specific location. The suspicious behavior of the passerby, who has a suspicious amount of knowledge about the materials used in the bomb and attempts to run away when questioned further, can be strong evidence of his involvement in the crime. This behavior, along with any other supporting facts, can be presented to a judge to request a search warrant.
The Fourth Amendment of the United States Constitution protects individuals from unreasonable searches and seizures. However, there are exceptions to the requirement of obtaining a search warrant. For example, if there is consent from the individual to be searched, if there are exigent circumstances where evidence may be destroyed or tampered with before a warrant can be obtained, or if the items in question are in plain view of government officials, a search warrant may not be necessary.
In this case, the suspicious behavior and the potential involvement of the passerby in the bomb incident can provide the investigators with probable cause to request a search warrant. They can present this information to a judge and demonstrate that there is a reasonable expectation of finding evidence relating to the bomb incident. If the judge finds the presented evidence sufficient, a search warrant can be issued.