low platelets and measuring blood pressure

I am a student doing my Med-Surg rotation on a hem-onc floor. The standard practice there is to do manual blood pressure measurments rather than using the automatic blood pressure devices, and I was told it was because of low platelets and bleeding/bruising risk. Is this evidence-based practice? It makes sense, but I am looking for literature to support this for an assignment, and I can't seem to find any! Anyone have anything on this??

[As an aside, I hope to be an oncology nurse and feel very fortunate to be working on this floor!]