Evergreen Hedge Brown on Neighbor's Side: Herbicide Drift?

29 evergreens (yews?), 28 yrs old. Bottoms brown only on neighbor's side. Neighbor hates them. Grass also dying there. Cause? Help?

Herbicide Drift Strongly Suspected

One-sided browning + dead grass = lawn herbicide overspray/drift. Neighbor or lawn service likely applied broadleaf weed killer.

Remediation

1. Heavy watering to leach chemical from root zone.
2. Fall + spring fertilization to push new growth.
3. Document & communicate with neighbor (photos, dates).

Yews (Taxus) often recover if caught early.