"...There’s an interesting paper by Ian Ayres and Cait Unkovic proposing “information escrows”. A person who reports sexual harassment reports to an information escrow with the understanding that the report will remain sealed until (say) two other reports are received about the same perpetrator. Once three reports are received, then all three reports are opened and given to authorities. This way, no single person has to worry about starting an investigation based on what seems like weak evidence. Also, for people (rightly) worried about repercussions from reporting, this way no individual has the sole responsibility for starting an investigation."
The paper is a very interesting read, do check it out.