Though his preferred field was criminal law, he handled almost all branches of law with equal ease and dexterity. Lekhi had a special charm for fighting the establishment, and was a well-known practitioner of constitutional laws and was famous for various
Public Interest Litigation. The senior advocate is remembered for his appearance before the
Shah Commission after the Emergency wherein he was appointed as government pleader, prosecuting the Nagarwala Case, defending Satwant Singh in the Indira Gandhi murder case, and as the lawyer for Zaheera Sheikh in the Best Bakery case etc. He also represented MPs in the bribery case leading to the Supreme Court defining privileges of Parliament and State Legislature. Lekhi was also the advocate for Rashtriya Mukti Morcha (RMM), an NGO, which filed a petition in the Jharkhand Mukti Morcha bribery case. He again represented the RMM, which raised the issue of the foreign origin of Congress president Sonia Gandhi in the Delhi High Court and the Supreme Court. One of his last appearances in the Delhi High Court was for Patriots' Forum, an NGO, which challenged the findings of the Justice
Rajinder Sachar Committee, meant to look into the social, economic and educational status of Muslims. He argued that promotion of Muslims as a religious community would result in "destruction" of the secular polity promised by the Indian Constitution. He conducted the cross examination of the
Assassination of Indira Gandhi as the defense counsel, the detailed and lengthy cross examination of Dr
T D Dogra, the sole medical witness, to challenge the veracity of Post-mortem examination is a classic example of his excellent skills in defense. ==Legal Acumen==