If there was someone who was tech-savvy in the administration, they could just implement laser technology to do what a wall would fail at, and for a much cheaper price.
Actual source of it already being implemented in India:
"The "laser walls" or fence are being monitored by the BSF which guards the Indo-Pak border in Jammu and Kashmir, Punjab, Rajasthan and Gujarat.
The decision to install these laser walls was taken by the BSF two years ago keeping in mind the vulnerability of the border in these areas as barbed wire fencing could not be installed in many infiltration prone areas due to treacherous terrain or marshy riverine topography.
After the Pathankot terror attack, where it was suspected that terrorists crossed over from Pakistan by breaching the border from Bamiyal area in Punjab, Union home ministry and BSF sped up the deployment and activation of these walls along the long and winding border.
"The laser walls have started working and their functioning is being monitored. Preliminary results in detecting illegal movements are encouraging," the official said.
He said sensors were being monitored through a satellite-based signal command system and armed with night and fog operability tools.
Apart from these, four other pilot projects of similar kind in stretches of 30-40 kms of international border in Jammu and Gujarat and one in West Bengal along Indo-Bangla border have been approved by Home Ministry to secure Indian borders effectively."