DRS Decision Review System Complete Guide: How It Works in Cricket

The Decision Review System (DRS) has changed cricket more than any rule in the last 20 years. It has reduced howlers, empowered players, and added a tactical layer to captaincy. But a lot of viewers still aren't fully sure how it works — what counts as umpire's call, how many reviews a team gets, and which technology decides what. This is the complete explainer, written for cricket fans who want to understand DRS end-to-end.

What is DRS?

DRS is a system that lets the fielding or batting side challenge an on-field umpire's decision. If a batter is given out, they can review. If a batter is given not out, the fielding captain can review. The review is then adjudicated by the TV umpire, who uses a combination of broadcast replays, ball-tracking technology, audio and heat-based tools to make a final call.

The key idea is that the on-field umpires remain the primary decision-makers. DRS exists to correct clear errors — not to make umpires redundant.

The technology inside DRS

DRS isn't one piece of tech. It's a stack.

• Hawk-Eye (ball tracking). Multi-camera system that predicts the ball's path after pitching. Used for LBW decisions.
• UltraEdge / Snicko. Synchronised audio and video that shows whether the ball touched the bat or pad. Primary tool for caught-behind and bat-pad decisions.
• Hot Spot. Infrared imaging that highlights contact points where the ball touches the bat or pad (heat from friction shows as a white mark). Not used in every series due to cost, but standard in major tournaments.
• Super-slow-motion cameras. Broadcast replays at up to 1000+ frames per second. Used for front-foot no-balls, run-outs, stumpings and general close decisions.

In the IPL in particular, UltraEdge, Hawk-Eye, and high-frame-rate replay work together. Hot Spot is used depending on broadcast availability.

How a DRS review works — step by step

1. On-field decision. The umpire makes a call — out or not out.
2. Review signal. The fielding captain or dismissed batter makes the "T" sign within a fixed window (usually 15 seconds).
3. Third umpire takes over. The TV umpire reviews the available technology.
4. Evidence check. Depending on the mode of dismissal, the third umpire checks no-ball, bat hit, pad hit, and ball tracking in a specific order.
5. Communication. The third umpire tells the on-field umpire the verdict, and the original decision is either upheld or overturned.

This process usually takes 60-120 seconds. Long enough to build drama, short enough to not kill the over rate.

Umpire's call — the most misunderstood part

This is the single biggest source of fan confusion. "Umpire's call" only applies to LBW decisions. When ball-tracking shows the ball doing something marginal — barely hitting the stumps, barely pitching on the stumps, barely in line — the on-field umpire's original decision stands.

The three umpire's-call margins in LBW:

• Pitching in line. If more than half the ball pitched in line with the stumps, fully in line.
• Impact in line. Ball must hit the batter at least 50% in line with the stumps.
• Hitting the stumps. For "conclusive" hitting, more than 50% of the ball must hit the stump.

If any of these three goes into the marginal zone, the decision reverts to whatever the umpire said on the field. This is why the same ball-tracking output can produce "out" or "not out" depending on what the on-field umpire said first.

Review limits in IPL 2026

In IPL 2026, each side has:

• Two unsuccessful reviews per innings.
• A successful review retains the team's count.
• An "umpire's call" verdict is treated as not lost. The team keeps their review.

Reviews reset at the innings break. Teams typically save one for the death overs, when tight LBWs and caught-behinds can decide matches.

Why DRS matters tactically

Captains now plan reviews like bowling changes. They save them. They burn them. They coordinate with the wicketkeeper — because the keeper usually has the best angle for edges. Great captains in T20 know which bowler's workload is using up review cycles and plan accordingly.

For batters, DRS is about self-awareness. A batter who thinks they nicked it should not review. A batter who knows the ball pitched outside leg should. Poor reviews have become a mini-stat in T20 analysis.

What DRS hasn't solved

DRS is not perfect. It still struggles with:

• Faint edges where audio is inconclusive.
• Bat-pad overlapping sounds.
• Obstructing-the-field and rare dismissals where context is king.

But overall, the game is fairer, more accurate, and more fun to analyse because of it.

FAQ

Q: How many DRS reviews does each team get in IPL 2026? A: Two unsuccessful reviews per innings. Successful reviews and umpire's-call verdicts don't count against the team.

Q: What is umpire's call? A: In LBW decisions, when ball-tracking shows a marginal result, the on-field umpire's original decision stands.

Q: Is Hot Spot used in the IPL? A: It's been used in some tournaments; UltraEdge and Hawk-Eye are the primary tools in modern IPL telecasts.

Related reading

• IPL 2026 Pitch Report Decoder: What Terms Mean
• IPL Head-to-Head Records: Complete Guide
• Hawk-Eye Ball Tracking Technology in Cricket Explained