Can a scientific theory be incorrect?

"Can a theory be proven incorrect?" absolutely, even after it has been successfully proven a "good scientific theory" (proven as in experimented, documented, tested ect...... )The theory itself can be retested and then also be proven to be incorrect. Such as subtle changes in the environment of which the study was tested can alter the results to be give a true or false outcome. Thus, in my opinion much of the reasoning behind the statement nothing in the World is absolutely 100%.