A district decision after "a thorough review that uncovered several instances of non-compliance with our contractual obligations and safety standards."
The tool will allow residents to see incidents in any of the city's neighborhoods, including their own. It has symbols to show the type of crime committed.
Clarke had been with the department for two years. Earlier this year, he was recognized for his lifesaving efforts when responding to a call for a cardiac arrest.
Systems in New York and Chicago are making gates taller or stronger to deter people who try to slip through without paying, but St. Louis is going even further.