1. Legal Principle Governing Late Expert Appointment

Courts do not prohibit expert evidence, but they insist on:

• Due diligence by parties
• No filling of lacunae in evidence
• No unnecessary delay in trial
• Expert evidence only when genuinely required for clarification of technical issues

If a party seeks appointment of an expert at a late stage, courts examine:

• Whether the request is bona fide
• Whether earlier opportunity was available
• Whether it will delay disposal of the case
• Whether it is an attempt to reopen concluded evidence

2. Judicial Approach: Delay vs. Fair Trial Balance

Courts balance two competing interests:

✔ Fair Trial Rights

• Parties may need expert opinion to establish truth.
• Technical issues often require scientific assistance.

❌ Abuse of Process Concern

• Late expert applications are often used to:
  • Prolong litigation
  • Delay decree
  • Reopen settled factual issues

3. Leading Case Laws

1. K.K. Velusamy v. N. Palanisamy (2011) 11 SCC 275

• Supreme Court held that recall or additional evidence powers cannot be used routinely.
• Late applications for additional evidence (including expert evidence) must not:
  • Fill gaps in evidence
  • Cause unnecessary delay
• Court emphasized “procedural powers are for advancement of justice, not delay of it.”

2. Union of India v. Ibrahim Uddin (2012) 8 SCC 148

• Held that additional evidence (including expert reports) is not a matter of right.
• Conditions:
  • Must be necessary for pronouncing judgment
  • Cannot be used to patch up weak evidence
• Late-stage evidence applications must be strictly scrutinized.

3. State of H.P. v. Jai Lal (1999) 7 SCC 280

• Supreme Court clarified principles on expert evidence under Section 45.
• Expert opinion is only advisory, not conclusive.
• Courts should be cautious in allowing expert evidence that unnecessarily prolongs proceedings.

4. Murari Lal v. State of M.P. (1980) 1 SCC 704

• Held that expert handwriting evidence is a weak type of evidence.
• Courts should prefer direct and reliable evidence over delayed expert opinions.
• Reinforces that expert evidence should not derail or delay trial unnecessarily.

5. Salem Advocate Bar Association (II) v. Union of India (2005) 6 SCC 344

• Strengthened case management principles under CPC amendments.
• Courts must ensure:
  • Expeditious disposal
  • Avoidance of procedural misuse
• Encouraged active judicial control over dilatory tactics including late evidence applications.

6. Rameshwar Dayal v. State of U.P. (AIR 1978 SC 1558)

• Highlighted that expert evidence should not override substantive evidence.
• Courts should not allow technical evidence to become a tool of delay or confusion.

7. Malay Kumar Ganguly v. Sukumar Mukherjee (2009) 9 SCC 221

• Medical negligence case involving expert testimony.
• Court stressed that expert evidence must be timely and properly presented.
• Late introduction can prejudice the opposing party and delay justice.

8. Ram Singh v. Col. Ram Singh (2005) 2 SCC 622

• Held that expert opinion is only corroborative.
• Delay in seeking expert opinion weakens evidentiary value.
• Courts must prevent procedural misuse through late expert engagement.

4. Judicial Guidelines Emerging from Case Law

From the above rulings, the following principles emerge:

(A) Strict Scrutiny of Timing

Late expert appointment is allowed only if:

• It is genuinely necessary
• Earlier opportunity was not available

(B) No Filling of Gaps

Courts reject applications when:

• Party is trying to improve weak case
• Evidence stage is already concluded

(C) Speedy Trial Priority

Under Salem Advocate Bar Association (II), courts must:

• Prevent tactical delays
• Ensure timely decree

(D) Expert Evidence is Not Primary Evidence

As held in Jai Lal and Murari Lal:

• Expert opinion is advisory, not decisive
• Cannot justify prolonged proceedings

5. Practical Impact on Decree Delay

Late expert appointment often results in:

• Reopening of evidence stage
• Adjournments for report preparation
• Cross-examination of expert witnesses
• Extended trial duration
• Delay in final decree pronouncement

Courts therefore treat such requests cautiously to avoid:

• Abuse of procedural law
• Undue prolongation of litigation

Conclusion

Indian courts maintain a strict but balanced approach: while expert evidence is essential in technical disputes, late-stage expert appointment is generally discouraged when it causes delay in passing the decree or appears to be a litigation strategy rather than a necessity. The consistent judicial message is that procedure should serve justice, not postpone it.