//First define TEAMS
#define TEAM_SWAT 0
#define TEAM_OTHER 1

new gTeam[MAX_PLAYERS];

//Now you may assign team by 
public OnPlayerRequestClass(playerid, classid)
{
    if(classid==0) gTeam[playerid] = TEAM_SWAT;
    //and so on
    return 1;
}
/*

++++++++NOW UNDER ON PLAYER UPDATE++++++++++
*/
public OnPlayerUpdate(playerid)
{
    if(gTeam[playerid]!=TEAM_SWAT) return 1;
    //And all the laser code here
    return 1;
}

forward GetTeam(playerid);
public GetTeam(playerid)
{
    return gTeam[playerid]; 
}

//and in Laser filterscript add
public OnPlayerUpdate(playerid)
{
    new team = CallRemoteFunction("GetTeam","i",playerid);
    if(team!=0) return 1; //We defined TEAM_SWAT as 0 .
    //And all the laser code here
    return 1;
}