se_bbpm_add_spam_check.php

<?php

function se_bbpm_add_spam_check() {

	/**
	  * add spam check for users with bbp_spectator and bbp_participant roles
	  * Add more roles in the $targetRoles line or replace existing ones to match
	  * your targeted users
	  */

	$targetRoles = array( 'bbp_participant', 'bbp_spectator' );

	$current_user = wp_get_current_user();

	foreach( $targetRoles as $role ) {
		if( in_array( $role, $current_user->roles ) )
			return true;
	}

	return false;
}