A Massachusetts state trooper videotaped appearing to pepper-spray a protester during a Boston demonstration has returned to full duty.
State police said on Friday that the apparent victim has not filed a complaint or responded to requests to be interviewed.
Kin Moy, of Cambridge, has said he was pepper-sprayed while trying to record a man being arrested on a highway on-ramp Dec. 4 as hundreds protested the killings of unarmed black men by police in Ferguson, Missouri, and Staten Island, New York.
State police say they attempted to visit Moy at home, reached out to a relative, left contact information at "a location he frequents" and sent a written request by certified mail.
The trooper, whom police have not identified, was initially placed on restricted duty.