What is the Anti-defection law?

Supreme Court recently said that legislators facing disqualification under the anti-defection law cannot participate in the floor test.

About Anti-defection law :

It was introduced in India in 1985 through the 52nd amendment to the Constitution of India.
This amendment added the Tenth Schedule to the Constitution, which lists out the provisions related to defection.
It lays down the process by which legislators may be disqualified on grounds of defection by the Presiding Officer of a legislature based on a petition by any other member of the House.
This schedule applies to both Central and State legislature.
Aim: The main aim of this schedule was to prevent political defections and to strengthen democracy by bringing stability in politics and make members of parliament more responsible and loyal to their parties.

Grounds of disqualification: A member of any state or central legislature can be disqualified from being a member if,
He voluntarily gives up his membership of a political party.
He disobeys the directions of his political party or votes or does not vote in the legislature contrary to the directions of his political
After the election, he joins another political party.
If a nominated member joins any political party after 6 months from the day, he becomes a member of the legislature.

Exemptions:
Disqualification of a member is not applied in case of a merger, provided that this merger with or into another party shall be done with the consent of at least two-thirds of its legislator In such a scenario, neither the members who decide to merge nor the ones who stay with the original party will face disqualification.
It exempts the speaker, chairman, and deputy chairman of various legislative houses from disqualification on the ground of defection.

Deciding authority:
The decision to disqualify a member under the anti-defection law is taken by the presiding officer of the house. ( Speaker or Chairman accordingly).
The law does not specify a time period for the Presiding Officer to decide on a disqualification plea.
The decisions of the Speaker or Chairman in anti-defection cases are subject to judicial review.
However, there can not be any judicial intervention until the Presiding Officer gives his order.

Source : Legislator facing disqualification can’t attend floor test: Supreme Court