Carpenter was handed a one-year suspension for violating MiLB's joint drug prevention and treatment program, Bob Nightengale of USA Today reports.
Carpenter will be a part of the Reds' 60-man player pool this season.
Carpenter was reassigned to minor-league spring training Tuesday.
Carpenter signed a contract with the Reds on Friday, Jon Heyman of MLB Network reports.
Carpenter was sent outright to Triple-A Nashville on Wednesday.
Carpenter was designated for assignment Monday.
Carpenter had his contract selected from Triple-A Nashville on Tuesday, Evan Grant of The Dallas Morning News reports.
Carpenter cleared waivers Monday and was outrighted to Triple-A Nashville.
Carpenter was designated for assignment on Saturday.
Carpenter had his contract selected from Triple-A Nashville by the Rangers on Friday.