Detect if all objects between two points are of same tag in Unity

I am making a game where the floor consists of individual live and dead pixels. If a line of live pixels are drawn between the two points, you pass. If the line is broken, you cannot pass.

I would like to detect wether all objects between two points are of the same Tag. Here is a drawing to try and illustrate this:

At the moment, I have the following code that checks if the next "pixel" is live or dead using RayCasts:

 function Update () {
 
 var pixfwd = transform.TransformDirection (Vector3.up  * Reach);
 var pixbwd = transform.TransformDirection (Vector3.down  * Reach);
 var pixleft = transform.TransformDirection (Vector3.left * Reach);
 var pixright = transform.TransformDirection (Vector3.right * Reach);
 
 Debug.DrawRay(transform.position, pixfwd * Reach, Color.red, 0.1f);
 Debug.DrawRay(transform.position, pixbwd * Reach, Color.green, 0.1f);
 Debug.DrawRay(transform.position, pixleft * Reach, Color.yellow, 0.1f);
 Debug.DrawRay(transform.position, pixright * Reach, Color.blue, 0.1f);
 
 Physics.Raycast (transform.position, pixfwd, pixhit);
 Physics.Raycast (transform.position, pixbwd, pixhit2);
 Physics.Raycast (transform.position, pixleft, pixhit3);
 Physics.Raycast (transform.position, pixright, pixhit4);
 
 
 if ( checkVision(pixhit)  || checkVision(pixhit2)  || checkVision(pixhit3)  || checkVision(pixhit4) ) { 
     nextisLive = true;
 }
 else
 {   
     nextisLive=false;
 }
 
 }
 
 function checkVision(pixhit:RaycastHit):boolean
 {
 if ( pixhit != null && pixhit.collider != null && pixhit.collider.tag == "Live" )
 {
     return true;
 }
 return false;
 
 if ( pixhit2 != null && pixhit2.collider != null && pixhit2.collider.tag == "Live" )
 {
     return true;
 }
 return false;
 
 if ( pixhit3 != null && pixhit3.collider != null && pixhit3.collider.tag == "Live" )
 {
     return true;
 }
 return false;
 
 if ( pixhit4 != null && pixhit4.collider != null && pixhit4.collider.tag == "Live" )
 {
     return true;
 }
 return false;
 }