I think that the fields of knowledge might be far apart to have much cross-over. That is, I can see some fields which are saavy on the radiointerference, but I just don’t think most pharmaceutical validation or engineers are too aware of radio-interference.
But I’ll take a shot/guess at answering. The electromagnetic interference can affect EM signals. Do you have EM signals which need to be protected? Are you sending/receiving data near your process? Are you collecting data wirelessly for your process? Or is your wireless just for phone and internet?
Even if your process send/receives data wirelessly I suspect that the liklihood of something going wrong is actually super low. - if you use a risk based approach you might find that the level of detection is high (low risk), the liklihood of failure is low (low risk), and impact to product is probably low as well (low risk). From this perspective, I think you could get away without testing for radio interference…
Again, I"m no expert, and I remember seeing it once a long time ago, and thinking it was a tad silly (again, I’m no expert, so I might get eviscerated here on this opinion).