DNA tests are done by cotton swab of your 'live' cheek. Should they only be done on 'dead' dandruff? In any case, it should be pretty easy to recreate a suffi

DNA tests are done by cotton swab of your 'live' cheek. Should they only be done on 'dead' dandruff? In any case, it should be pretty easy to recreate a sufficiently-convincing fake finger given an ink fingerprint. But that all misses the point. The only reason passwords get special treatment is that an order to compel production of a password is an order to testify against oneself. For example, unless the defendant already admits to knowing the password, the fact that the defendent knew the password after production would be obviously prejudicial. It would be tantamount to requiring the defendent to testify, "yes, it was me". In other words, compulsory production of information whose existence and location is not a foregone conclusion probably falls foul of the Fifth Amendment. Compulsory production of your finger does not require you to provide any information other than information that clearly exists about you. (IANAL)