text:  Although Richmond attempted a comeback in 1988 , NASCAR suspended him for testing positive for banned substances . The substances were identified as <unk> , a non @-@ prescription over @-@ the @-@ counter allergy medication , and Advil , an over @-@ the @-@ counter pain reliever . In April 1988 , Richmond sued NASCAR over the suspension . Although he retested later that year and was reinstated , he could not find a car to drive . In his final public appearance in February 1988 , Richmond denied that he abused drugs and said that a mistake had been made in his drug test . His suit with NASCAR was settled out @-@ of @-@ court , the terms sealed . 
  