SR22 pilot discovers after a flight that she may have penetrated a law enforcement TFR earlier in the day. The FAA map did not display the TFR but a NOTAM did exist.

Narrative

The aircraft owner and I had flown to his home airport that morning and I flew the aircraft solo on a north heading back to our FBO for servicing. Prior to his picking me up; I checked the FAA national map showing Temporary Flight Restrictions to see if anything would affect the ferry flight. I also checked local NOTAMs for the departure and destination airports; which is something I always do before such flights. No TFRs were indicated on the map along the route I was to fly. Enroute from Illinois; I followed the direct route as indicated on the GPS; flying between 2;500 and 2;900 FT. Somewhere near the state line; the traffic watch on the aircraft indicated 2 or 3 aircraft ahead of my position; near and below my altitude. I altered my course to the left and did a slight climb; which seemed to be the best course of action at the time; as some of the traffic appeared to be descending to a nearby airport that was off to my right. It was hazy at altitude and difficult to visually see traffic; so I relied heavily on the traffic watch screen for avoidance. The rest of the 35-minute flight was uneventful.When I was preparing for a subsequent flight an hour later; I again checked the TFR map but for some reason I also pulled up the accompanying list and spotted one for northern Illinois; near the state line; 31 NM northeast of the Rockford VOR. It was posted by local law enforcement earlier in the day for a cadaver search in the area; and the TFR was for a 6-mile ring below 3;000 FT. I realized I might have inadvertently flown into the designated search area when I altered course for traffic; potentially interfering with said operations and causing a traffic hazard. I also realized that the TFR map has limitations in that it does not necessarily mark every single TFR. I plan to improve my preflight planning by checking multiple sources for TFR's.