We report multifrequency measurements of scatter-broadening times for nine highly dispersed pulsars over a wide frequency range (0.6-4.9 GHz). We find the scatter-broadening times to be larger than expected and to scale with frequency with an average power-law index of 3.44 ± 0.13, i.e., significantly less than that expected from standard theories. Such possible discrepancies have been predicted very recently by Cordes and Lazio.
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