diff --git a/net_alerter/net_alerter.py b/net_alerter/net_alerter.py
index c3613e1..e2cc4c5 100644
--- a/net_alerter/net_alerter.py
+++ b/net_alerter/net_alerter.py
@@ -827,12 +827,10 @@ def seed_from_arp_cache():
             if mac == "00:00:00:00:00:00" or flags == "0x0":
                 continue
 
-            # Labeled personal devices must NOT be silently seeded — they need
-            # a real on_arrival call so ARRIVED fires when they rejoin.
-            # Just update last_seen as a baseline so the watchdog has a reference.
-            with personal_lock:
-                is_personal = mac in device_labels or mac in personal_devices
-            if is_personal:
+            # Personal devices (phones, wearables — any LAA MAC, known mobile OUI,
+            # or explicitly labeled MAC) must NOT be silently seeded. The operator
+            # needs ARRIVED for every device they don't already know about.
+            if is_personal_device(mac):
                 with last_seen_lock:
                     if mac not in last_seen:
                         last_seen[mac] = time.time()