In the United States, it is legal to use the fingerprint of the deceased to unlock his mobile phone. According to Forbes, the US legal department has been using this method for many years to promote relevant procedures.
The report was also confirmed by the FBI forensic expert Bob Moledor. He also said that law enforcement agencies have been using the fingerprints of the deceased to use Apple's Touch ID security features at least since 2016.
Touch id
Forbes pointed out that the information was obtained from several different sources, close to the resources of the Investigation Bureau of the local and federal police stations. This behavior seems to have become a practice in the industry, especially in the case of dealing with death from drug overdose. The police can quickly find the drug dealer's phone number through this method.
However, this method is not a panacea. This is because once the mobile phone is pre-set for 48 hours, then the mobile phone still needs the user to manually input the password before unlocking, so the Touch ID can play a role.