Yaar Asha... Just noticed something in the visitor's detail form...taking into account the scenario that you have explained...I feel DATE & IN/OUT TIME of the Visitor should also be included.And "the affix photo" ..I wonder if visitors will carry photos with them(taking into the fact that the employees are 12th or less passed outs).
- marital status ans sex should also be included in a basic form
- You can also ask the visitor to carry the form with them and get it also signed by the one whom they visited and shuould return the same on exit.this way you can have check if that visitor has met the same person whom he informed to meet at the entrance