diff --git a/planetstack/core/models/slice.py b/planetstack/core/models/slice.py
index 50b10c5..e474560 100644
--- a/planetstack/core/models/slice.py
+++ b/planetstack/core/models/slice.py
@@ -2,6 +2,7 @@
 from django.db import models
 from core.models import PlCoreBase
 from core.models import Site
+from core.models.site import SitePrivilege
 from core.models import User
 from core.models import Role
 from core.models import Deployment
@@ -51,10 +52,17 @@
             return False
         if user.is_admin:
             return True
+        # slice admins can update
         slice_privs = SlicePrivilege.objects.filter(user=user, slice=self)
         for slice_priv in slice_privs:
             if slice_priv.role.role == 'admin':
                 return True
+        # site pis can update
+        site_privs = SitePrivilege.objects.filter(user=user, site=self.site)
+        for site_priv in site_privs:
+            if site_priv.role.role == 'pi':
+                return True
+ 
         return False
 
     @staticmethod
@@ -62,7 +70,12 @@
         if user.is_admin:
             qs = Slice.objects.all()
         else:
+            # users can see slices they belong to 
             slice_ids = [sp.slice.id for sp in SlicePrivilege.objects.filter(user=user)]
+            # pis can see slices at their sites
+            sites = [sp.site for sp in SitePrivilege.objects.filter(user=user)\
+                        if sp.role.role == 'pi']
+            slice_ids.extend([s.id for s in Slice.objects.filter(site__in=sites)]) 
             qs = Slice.objects.filter(id__in=slice_ids)
         return qs