We're all likely aware of the big Apple vs FBI case where the FBI wants to force Apple to open a back door in its encryption on iPhones, and we'll soon discover what the law will decide on that, but it got me thinking:
Obviously a subject could claim that he forgot his password, so that's a dead end, but with fingerprint scanners on new iPhones that leads to a few possibilities. Could the FBI legally do any / all of the following? Why or why not:
Retrieve fingerprints from a surface the subject makes contact with while in custody to artificially pass the fingerprint scan on an iPhone.
Force the subject to place his finger on the fingerprint scanner.