--- title: "Tag Compliance" canonical: "https://ai-docs.certero.com/space/CXCM/108299442/Tag%20Compliance" format: markdown --- Tag Compliance policies will track the adherence of custom sets of resources to custom tag key criteria. Policies have a start date, and a set of filters to define the resources scope. There are three types of policy:  **Required tag** checks that resources in scope have a specific tag key assigned. **Prohibited tag** checks that resources in scope **do not** have a specific tag key assigned. **Tags correlation** checks that resources with one key must also have a second. The policy example below checks that load balancers in the Azure Dev pool have an **owner **tag key assigned:  Users will receive [Email Notifications](https://certero.atlassian.net/wiki/spaces/CXCM/pages/108298614) of tag policy breaches, and breaches will be called out on the **Policy Violations **tile of the **Executive Dashboard**. The main **Tag Compliance** screen shows a list of existing policies and their compliance status. Clicking on a policy opens the policy details screen, where you can inspect the violation history for the policy and switch to the [Resources](https://certero.atlassian.net/wiki/spaces/CXCM/pages/108298896) screen, pre-filtered to show the non-compliant resources:  > ℹ️ Note that once a policy is configured, you can’t edit the criteria or filters, as this would break the validity of the violation history.