How DRS Works in Cricket Explained Simply

Cricket is often decided by the smallest margins. A single incorrect decision can completely change the outcome of a match. To reduce such errors, the International Cricket Council introduced the Decision Review System (DRS), allowing players to challenge umpire decisions using advanced technology.

But how does DRS actually function? What happens after a player signals for a review? And why do some decisions end up as “Umpire’s Call”? Let’s break it down in the simplest way.

Table of Contents
What Is DRS in Cricket?
Who Can Take a DRS Review?
The 15-Second Rule — DRS Timer
How Many Reviews Does Each Team Get?
Step-by-Step: What Happens During a DRS Review?
The Technology Behind DRS Explained Simply
What Is Umpire’s Call in DRS?
What Decisions Can Be Reviewed via DRS?
Player Review vs Umpire Review
DRS in IPL vs International Cricket
Why DRS Has Changed Cricket Forever
Frequently Asked Questions
What Is DRS in Cricket?

DRS stands for Decision Review System. It is a technology-based process designed to help correct possible mistakes made by on-field umpires. You can think of it as a second opinion powered by cameras, sensors, and ball-tracking systems.

Before DRS was introduced, players had no way to challenge decisions. Once given out, they had to leave the field without question. The system was first tested in a Test match between India and Sri Lanka in 2008. It officially became part of Test cricket in 2009, followed by ODIs in 2011 and T20 Internationals in 2017.

Who Can Take a DRS Review?

Not every player can request a review. The rules are quite specific:

If a batsman is given out, only that batsman can request a review.
If the fielding team disagrees with a “not out” decision, only the captain can ask for a review.
Players must decide on their own—no help from the dressing room is allowed.

To signal a review, the player makes a “T” shape with both hands at head height toward the umpire.

The 15-Second Rule — DRS Timer

Once the ball is declared dead, the team has only 15 seconds to request a review. This rule ensures that decisions are made quickly and prevents outside influence. If the time limit is exceeded, the review opportunity is lost.

How Many Reviews Does Each Team Get?

Each team is allowed 2 unsuccessful reviews per innings across all international formats:

Format    Reviews Per Innings (Unsuccessful)
Test Match    2
ODI    2
T20I    2

Important Rule:
A review is only deducted if it is unsuccessful. If the decision is overturned, the team keeps the review.

Step-by-Step: What Happens During a DRS Review?

Here’s how the process works:

Signal — The player makes the “T” sign within 15 seconds.
Umpire Acknowledges — The on-field umpire communicates with the Third Umpire.
No-Ball Check — The delivery is first checked for a no-ball. If it is, the batsman cannot be out.
Technology Review — Tools like Hawk-Eye, UltraEdge, and cameras are used.
Final Decision — The Third Umpire gives the verdict, and the on-field umpire confirms it.
The Technology Behind DRS Explained Simply
Hawk-Eye (Ball Tracking)

Hawk-Eye uses multiple cameras to track the ball’s path. For LBW decisions, it predicts whether the ball would have hit the stumps.

UltraEdge (Snickometer)

This system uses sensitive microphones to detect sound when the ball touches the bat. A spike on the waveform indicates a possible edge.

Hot Spot

Hot Spot uses infrared imaging to show contact points on the bat or pad as bright marks. However, it is not always available in every match.

Ultra-Motion Cameras

These high-speed cameras are used for close decisions like run-outs, stumpings, and boundary checks.

What Is Umpire’s Call in DRS?

This is one of the most confusing aspects of DRS.

For LBW decisions, Hawk-Eye checks three things:

Where the ball pitched
Where it hit the batsman
Whether it would hit the stumps

If the result falls within a small margin of uncertainty, the decision becomes Umpire’s Call.

Meaning:
The technology is not 100% certain, so the original on-field decision stays.

Key Point:
Teams do not lose their review if the result is Umpire’s Call.

What Decisions Can Be Reviewed via DRS?

DRS can be used for:

LBW decisions
Caught-behind appeals
Run-outs and stumpings
Boundary decisions
Close catches

Not allowed:

No-balls
Wides (in international cricket)
Penalty decisions
Player Review vs Umpire Review

There are two types of reviews:

Player Review:
Requested by the batsman or fielding captain when they disagree with a decision.

Umpire Review:
Initiated by the on-field umpire for close calls like run-outs or boundary decisions.

DRS in IPL vs International Cricket

The Indian Premier League has slightly different DRS rules:

Players can review wide ball decisions (not allowed in ICC matches).
Rules may vary slightly each season.
Not all domestic leagues use DRS due to high costs.
Why DRS Has Changed Cricket Forever?

Before DRS, many matches were affected by clear umpiring mistakes. Now, most obvious errors are corrected.

DRS has also added a strategic element to the game. Teams must think carefully before using reviews. Wasting them early can be costly later in the innings.

It has made cricket fairer, more accurate, and even more exciting for fans.

Frequently Asked Questions
1. What does DRS stand for in cricket?

DRS stands for Decision Review System, a technology-based method used to review umpiring decisions.

2. How many DRS reviews does each team get per innings?

Each team gets 2 unsuccessful reviews per innings. Successful reviews are not deducted.

3. What is Umpire’s Call in DRS?

It means the technology cannot give a clear decision, so the original umpire’s call stands.

4. Can a batsman review a no-ball using DRS?

No, DRS does not allow players to review no-balls or wides in international cricket.

5. When was DRS first used in cricket?

It was first tested in 2008 during a Test match between India and Sri Lanka and officially introduced in 2009.

Understanding DRS can completely change the way you watch and analyze cricket, especially during those nail-biting moments when every decision counts. If you enjoy breaking down such game-changing rules and staying ahead with in-depth insights, make sure to explore more content on sportsplay24. From the latest cricket news to expert opinions and detailed match analysis, our platform brings you everything a true cricket fan needs. Don’t miss out dive into our regularly updated cricketblogs and stay one step ahead of the game.