U.S. Homeland Security Secretary Jeh Johnson has rejected a color-coded scheme to measure border security after hiring a consultant that dismissed the idea as simplistic and misleading.

The proposed index came after a color-coded system to measure terror threats was dropped in 2011 amid widespread confusion and ridicule.

Agency staff proposed the system of reds, yellows and greens in 2014. The Institute for Defense Analyses says in a 53-page report obtained by The Associated Press that Homeland Security should avoid repeating mistakes.

The proposal was never made public, nor was the consultant's report. Asked about its status, agency spokeswoman Gillian Christensen says there are no plans for a color index to measure border security.