[js1138]

If you read the article on the speed of light you will find there is no controversy. First, there is no evidence supporting any variation, and second, there is no reluctance to keep testing hypotheses.

[longshadow]

If you read the article on the speed of light you will find there is no controversy. First, there is no evidence supporting any variation, and second, there is no reluctance to keep testing hypotheses.

As is born out by the following comment from Ned Wright's Cosmology website:

Variable Constants?

9 Jan 2004 - Chand et al. (2004) present data on the time variation of the fine structure constant alpha that contradict previous claimed detections of a variation. The latest result is -0.6+/-0.6 parts per million for the change which is consistent with zero and much more accurate than the claimed -5.4+/-1.2 parts per million variation. So this constant appears to be constant.

Source: http://www.astro.ucla.edu/~wright/cosmolog.htm#News