"Dry needling is unsafe when performed by physical therapists. 

Dry needling is safe when performed by qualified practitioners of acupuncture , such as physicians and acupuncturists, but it is unsafe when performed by physical therapists-due to inadequate and improper training in acupuncture- as evidenced by the following example:

In Colorado, a physical therapist punctured freaskier T. Y. W.'s right lung with an acupuncture needle, causing damage to the lung that led to a pneumothorax ( an accumulation of air between the lung and the chest wall, causing the lung to collapse). He required surgery to treat the pneumothorax and was hospitalized for five days."

Reference: 

https://m.facebook.com/paulobarrosmtc/photos/a.666077923531009/693083487497119/?type=3&_rdr