If they can make it a little bit more robust, there would be a huge market for removing toxic plants. I was just quoted over $1000 to remove poison ivy from a 500 sq ft. wooded area of property. My satisfaction was not guaranteed.
Just buy or rent a goat. Those things love poison ivy.
Why use lasers when we can genetically engineer goats to hate the taste of corn/sorghum/wheat and love the taste of weeds?