# Blocking tags using Guardian
Asking consent is not enough for your website, you need to be sure that cookies or others tracking technologies are not used without the consent of the user.
**For this, we propose a script called Guardian.**
{% hint style="info" %}
**INFO**
At this point, we assume that you followed the instructions in this section to install the CMP
{% endhint %}
## 1. Setup the whitelist/blacklist list in the ``
In the `` section, configure the urls to be blacklisted or whitelisted in the **dynamicallyLoadedScripts** in the parameter of the **configSFBXAppConsent** configuration variable like this :
```html
```
{% hint style="info" %}
**INFO**
In the code above, we take control on Facebook and Youtube. If you want to add a new domain, let's say **ads-twitter.com, just add this new entry**
```
,/ads-twitter.com/
```
{% endhint %}
## 2. Add the Guardian script
Add the Guardian script in the `` section, after the definition of the **configSFBXAppConsent** variable.
```html
```
{% hint style="danger" %}
**IMPORTANT**
The Guardian script must be placed after the configSFBXAppConsent variable to work.
{% endhint %}
That's it - All the tags are now blocked until the user consent. If the user deny cookies in the cmp, the tags will remains blocked.
{% hint style="info" %}
**INFO**
This library is using observer and override CreateElement core JS functionalities. If you expriment tests that are not working, please deactivate Chrome or Firefox extension in your browser.
{% endhint %}
We will add new capabilities regularly (more controls, shared database of tags...)
Any issue or suggestions ? Drop an email at [**support@sfbx.io**](mailto:support@sfbx.io)
---
# Agent Instructions: Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.
Perform an HTTP GET request on the current page URL with the `ask` query parameter:
```
GET https://docs.sfbx.io/configuration/step-3-notice-implementation-web-app-tv/web-cmp/blocking-tags-using-guardian.md?ask=
```
The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.
Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.