There have been a number of allegations in the media with respect to electrical magnetic interference. To date, there have been no reports to support that, as far as technical findings. Toyota themselves have hired a third party; they've been very open about that. We have seen a copy of the preliminary report from that third party, and they have not been able to replicate electrical magnetic interference. It's speculation, but nobody has been able to show it to date.
On March 11th, 2010. See this statement in context.