IAM Access Analyzer is crucial for ensuring secure IAM policies by detecting unintended access in AWS.Custom policy checks like CheckNoNewAccess, CheckAccessNotGranted, and CheckNoPublicAccess help validate IAM policies.IAM Access Analyzer supports various capabilities including identifying unused permissions and public access to resources.Implementing IAM policy validation in CI/CD pipelines using IAM Access Analyzer promotes shift-left security.The cost of IAM Access Analyzer custom policy checks is $0.0020 per API call, making it essential to manage usage.AWS organizations should utilize Service Control Policies (SCPs) and Resource Control Policies (RCPs) as primary defenses.Github workflows integrated with IAM Access Analyzer validate IAM policies, ensuring adherence to security standards.Steps include configuring AWS and GitHub, setting up secrets, referencing policies, and implementing GitHub workflows for validation.Different IAM policies are demonstrated in CloudFormation templates to showcase pass and fail scenarios based on reference policies.Early validation of IAM policies in the development phase mitigates security risks and enhances the security posture of AWS infrastructure.