TADA was also successfully used against Tamil and Sikh militants and important cases like Rajiv Gandhi murder was solved with its help.
Later TADA was repealed by Congress as demanded by Muslim, pseudo-secular and Human (read Muslim) rights organizations while BJP tried its best to oppose this move. These organizations claimed anti-terror laws were against Muslims as most of the persons arrested under TADA happened to be Muslims (That shouldn’t have been surprising). The effect of this move was immediate, terrorist organizations like SIMI and PDP (Madhani) regrouped and we saw a series of homegrown terror attacks like Coimbatore series blasts.
After BJP came in power it brought in milder version of TADA called POTA after prolonged negotiations and amidst heavy opposition by pseudo-intellectual media and pseudo-secular politicians.
Pseudo-seculars are now claiming that POTA was ineffective because terrorism like Akshardham and Parliament attack happened even after POTA. This is a fallacy because there is an important difference. The attacks that time were committed by ISI sponsored terrorists who would come from across the border on a suicide mission. Attacks like that are difficult to stop.
At the same because of POTA we had managed to infiltrate local terrorist organizations and their activity was heavily subsided.