The Illinois Supreme Court appointed Carter an associate judge for Illinois's 13th circuit for a term beginning July 2, 1979.[8] He was elected a circuit court judge in 1988 and became the chief judge in 1992.[5]
Illinois Appellate Court service
Carter was appointed to the Illinois Appellate Court upon the retirement of Tobias Barry for a term beginning September 1, 2006.[9] He was succeeded as resident circuit judge by then-State's Attorney Joseph P. Hettel.[10]
Illinois Supreme Court
In the 2020 general election, incumbent Justice Thomas L. Kilbride received approximately 56% of the vote in favor of his retention, which is less than the supermajority of 60% required by state law to be retained.[11] After Kilbride lost retention, the Illinois Supreme Court appointed Carter as a placeholder until the 2022 general election. Carter's term began on December 6, 2020.[12] He left office on December 5, 2022, when his successor was sworn in.[13]