Since when has a photo or video footage of someone purportedly doing something, ever been solely sufficient evidence to arrest them?

Can you send the photos and large numbers of pixels to a forensics lab and get back a report, saying yes, that substance pictured is definitely a class A substance of type B?

Next time a major film is released showing a superstar actor or actress partaking of a drug, will the British police then arrest said person whence next
they arrive at Heathrow?

“I put it to you Miss Winehouse that on the date of January 22 you were filmed smoking and inhaling Class A drugzz..”

“I did inhale a white powder and some tablets but I don’t know the chemical composition of them Countstable innit.. I fink they was aspirin and icing sugar maybe like…can I go now? etc”