Final answer:
Bryant and Milam could not be convicted of murdering Emmett Till, even after admitting their involvement in Look magazine, due to the constitutional protection of double jeopardy.
Step-by-step explanation:
Bryant and Milam could not be convicted of murdering Emmett Till, even after admitting their involvement in Look magazine, due to the constitutional protection of double jeopardy. This legal protection prevents individuals from being tried for the same crime twice. In this case, since they were acquitted in their original trial, they could not be tried again for the same crime, regardless of their admission in the magazine.