A forensic scientist told a jury he had no doubt a homemade laboratory was producing illegal drugs.

Dr Ian Griffin, an expert in illicit drugs who works for the Forensic Science Service, was giving evidence at Lewes Crown Court.

Casey Hardison, an American chemist, is on trial accused of making a series of mind-altering drugs at his lab at the house he rented in Ovingdean, near Brighton.

The court has heard how police believe the lab, at a detached house called Montecillo, in The Vale, had the potential to make hallucinogenic drugs worth up to £5 million.

Hardison, who is representing himself, asked Dr Griffin how he could be sure the class A drugs were manufactured at the lab.

The doctor replied: "I have no doubt it was the intention to produce all six drugs. I base that on the particular combination of chemicals and the results of analysis."

Hardison, 33, questioned Dr Griffin about the chemicals found in the lab and whether they were all tested.

Dr Griffin said: "I didn't analyse every solid or every liquid that was at Montecillo. I didn't need to."

Dr Griffin accepted the range of chemicals discovered could be used for different purposes. He said: "All chemicals can be used for a variety of reactions. It's the combination which is important."

Hardison denies making five class A drugs and possessing another class A drug. He also denies possessing 145,000 doses of LSD, with a street value of around £1 million, with intent to supply and smuggling Ecstasy worth £4,000.

The trial continues.