I am using this script to drag/move gameobjects with the mouse. I need the script to ONLY recognize objects with a TAG, like "Painting", How can I fix this?

using UnityEngine; using System.Collections;

public class DragAndDrop : MonoBehaviour { private bool _mouseState; private GameObject target; public Vector3 screenSpace; public Vector3 offset;

 // Use this for initialization
 void Start()
 {

 }

 // Update is called once per frame
 void Update()
 {
     // Debug.Log(_mouseState);
     if (Input.GetMouseButtonDown(1))
     {

         RaycastHit hitInfo;
         target = GetClickedObject(out hitInfo);
         if (target != null)
         {
             _mouseState = true;
             screenSpace = Camera.main.WorldToScreenPoint(target.transform.position);
             offset = target.transform.position - Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z));
         }
     }
     if (Input.GetMouseButtonUp(1))
     {
         _mouseState = false;
     }
     if (_mouseState)
     {
         //keep track of the mouse position
         var curScreenSpace = new Vector3(Input.mousePosition.x, Input.mousePosition.y, screenSpace.z);

         //convert the screen mouse position to world point and adjust with offset
         var curPosition = Camera.main.ScreenToWorldPoint(curScreenSpace) + offset;

         //update the position of the object in the world
         target.transform.position = curPosition;
     }
 }


 GameObject GetClickedObject(out RaycastHit hit)
 {
     GameObject target = null;
     Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     if (Physics.Raycast(ray.origin, ray.direction * 10, out hit))
     {
         target = hit.collider.gameObject;
     }

     return target;
 }

}