def METHOD_NAME():
    """Retrieve the CA's files location"""
    # Grid-Security
    retVal = gConfig.getOption(f"{g_SecurityConfPath}/Grid-Security")
    if retVal["OK"]:
        casPath = f"{retVal['Value']}/certificates"
        if os.path.isdir(casPath):
            return casPath
    # CAPath
    retVal = gConfig.getOption(f"{g_SecurityConfPath}/CALocation")
    if retVal["OK"]:
        casPath = retVal["Value"]
        if os.path.isdir(casPath):
            return casPath
    # Look up the X509_CERT_DIR environment variable
    if "X509_CERT_DIR" in os.environ:
        casPath = os.environ["X509_CERT_DIR"]
        return casPath
    # rootPath./etc/grid-security/certificates
    casPath = f"{DIRAC.rootPath}/etc/grid-security/certificates"
    if os.path.isdir(casPath):
        return casPath
    # /etc/grid-security/certificates
    casPath = "/etc/grid-security/certificates"
    if os.path.isdir(casPath):
        return casPath
    # No CA's location found
    return False