diff --git a/pxii_bec/macros/policies.py.save b/pxii_bec/macros/policies.py.save
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+'''Define guard policies for devices in the beamline.'''
+# from guards import GuardViolation, guards_setup
+
+
+def is_sample_area_clear_for_beamstop(d):
+    '''Check if the sample area is clear of diag_y, coll_y, and gonx'''
+    g = guards_setup(d)
+    if g["diag_y_out"].check() and g["coll_y_out"].check() and g["gonx_out"].check():
+        return True
+    return False
+
+
+def is_sample_area_clear_for_gonx(d):
+    '''Check if the sample area is clear of diag_y and bs_z'''
+    g = guards_setup(d)
+    if g["diag_y_out"].check() and g["bs_work_min"].check():
+        return True
+    return False
+
+
+def make_gon_x_policy(d):
+    '''Create the policy for gon_x'''
+    def gon_x_policy(target):
+        cfg = d["gon_x"].positions
+        if target >= cfg["out"] and not is_sample_area_clear_for_gonx(d):
+            raise GuardViolation("Sample area is not clear")
+
+    return gon_x_policy
+
+
+def make_bs_z_policy(d):
+    '''Create the policy for bs_z'''
+    def bs_z_policy(target):
+        """Checks that the target position is within limits"""
+        cfg = d["bs_z"].positions
+        # Lower bound
+        if target < cfg["work_min"] and not is_sample_area_clear_for_beamstop(d):
+            raise GuardViolation("Sample area is not clear")
+        if target < cfg["min"]:
+            raise GuardViolation(
+                f"Requested beamstop Z {target} is below recommended minimum {cfg['min']}"
+            )
+        # Upper bound
+        if d["bl_pos"].pos == "in" and target > cfg["max_blin"]:
+            raise GuardViolation(
+                f"Beamstop Z cannot move beyond {cfg['max_blin']} when backlight is IN"
+            )
+
+    return bs_z_policy
+
+
+def make_diag_y_policy(d):
+    '''Create the policy for diag_y'''
+    def diag_y_policy(target):
+        cfg = d["diag_y"].positions
+        # Don't move in if the goniometer is >= 'in'
+        if d["gon_x"].actual >= d["gon_x"].positions["in"] and target > {cfg['out']}:
+            raise GuardViolation(
+                f"Diagnostic device cannot move beyond {cfg['out']} mm when goniometer is not OUT"
+            )
+        if d['cryo_pos'].pos == "in" and target > cfg["out"]:
+            raise GuardViolation(
+                f"Diagnostic device cannot move beyond {cfg['out']} mm when cryo is IN"
+            )
+
+    return diag_y_policy
+
+
+def attach_policies(d):
+    '''Attach the policies to the devices'''
+    d["bs_z"].policy = make_bs_z_policy(d)
+    d["gon_x"].policy = make_gon_x_policy(d)
+    d["diag_y"].policy = make_diag_y_policy(d)