I took over a residential account last month for both mowing and fertilization services. Applied pre-emergent on Sep 13 as we normally do here in North GA. My client had previously canceled the account with the company who shall remain nameless to protect the guilty. (It is not TG/CL) She calls me today and says, "They are out there spraying my lawn! What should I do?" Turns out the canceled company showed up and sprayed Pre-M mixed with Threeway today. So now her lawn has had 2 pre-emergent apps within 1 month. It has happened before....and it will happen again.