Final answer:
The pretrial identification procedure used with both juveniles and adults following arrest is fingerprinting.
Step-by-step explanation:
The pretrial identification procedure used with both juveniles and adults following arrest is fingerprinting. Fingerprinting is the process of taking an individual's fingerprints for identification purposes. This procedure is commonly used by law enforcement agencies to establish a person's identity and to compare fingerprints found at a crime scene with those in their database.