A chain of custody with extremely rigorous procedures and protocols is the only reason a forensic expert has some level of trust.
Without that, and with incentive, this becomes nothing more than a farce.
[0] https://www.howtogeek.com/203154/how-to-change-created-or-mo...
[1] https://www.freebsd.org/cgi/man.cgi?query=touch&sektion=1