diff --git a/web/app.react.js b/web/app.react.js
--- a/web/app.react.js
+++ b/web/app.react.js
@@ -42,6 +42,7 @@
 import DisconnectedBar from './redux/disconnected-bar';
 import DisconnectedBarVisibilityHandler from './redux/disconnected-bar-visibility-handler';
 import FocusHandler from './redux/focus-handler.react';
+import PolicyAcknowledgmentHandler from './redux/policy-acknowledgment-handler.js';
 import { useSelector } from './redux/redux-utils';
 import VisibilityHandler from './redux/visibility-handler.react';
 import history from './router-history';
@@ -155,6 +156,7 @@
             <FocusHandler />
             <VisibilityHandler />
             <DeviceIDUpdater />
+            <PolicyAcknowledgmentHandler />
             {content}
             {this.props.modals}
           </MenuProvider>
diff --git a/web/redux/policy-acknowledgment-handler.js b/web/redux/policy-acknowledgment-handler.js
new file mode 100644
--- /dev/null
+++ b/web/redux/policy-acknowledgment-handler.js
@@ -0,0 +1,41 @@
+// @flow
+
+import * as React from 'react';
+
+import { useModalContext } from 'lib/components/modal-provider.react.js';
+import { policyTypes } from 'lib/facts/policies.js';
+
+import TermsAndPrivacyModal from '../modals/terms-and-privacy-modal.react.js';
+import { useSelector } from './redux-utils.js';
+
+function PolicyAcknowledgmentHandler(): null {
+  const termsAndPrivacyState = useSelector(
+    state => state.userPolicies?.[policyTypes.tosAndPrivacyPolicy],
+  );
+  const [policyModalKey, setPolicyModalKey] = React.useState(null);
+  const { pushModal, popModal, modals } = useModalContext();
+
+  const policyModalVisible = React.useMemo(
+    () => modals.some(modalEntry => modalEntry[1] === policyModalKey),
+    [modals, policyModalKey],
+  );
+
+  React.useEffect(() => {
+    if (!termsAndPrivacyState) {
+      return;
+    }
+
+    const { isAcknowledged } = termsAndPrivacyState;
+    if (!isAcknowledged && !policyModalVisible) {
+      const modalKey = pushModal(<TermsAndPrivacyModal />);
+      setPolicyModalKey(modalKey);
+    }
+    if (isAcknowledged && policyModalVisible) {
+      popModal();
+    }
+  }, [policyModalVisible, popModal, pushModal, termsAndPrivacyState]);
+
+  return null;
+}
+
+export default PolicyAcknowledgmentHandler;