Even with physical evidence it can be absolute hell. I was dragged down an alley at knife point when I was at Uni & raped. The being dragged part was caught on CCTV, as was him legging it afterwards & me stumbling out of the alley with blood pissing down my face where he'd used the knife.
Because I didn't report it until three days later I was made to feel like I was lying. They took all my clothes - which had his gunk on as well as being covered in blood - they took photos of my neck & face & of the bruising to my wrists. I had to initially tell a male officer what happened, which in itself was so degrading; 'you say he raped you, what with? His hand, his penis, an object?' Then was told to wait for a specialist female officer to go over it again.
After all that, & having to do video statements, medical examinations, being told off by a female officer because I 'should have reported it immediately'; i was told the chances of it going to court were slim. After three months of absolute hell I dropped the case because I was final year of Uni, struggling massively & didn't want to throw three years of hard work down the shoot for something that I was being made to feel was my fault. Then I had to sign a statement to say i hadn't made it up!!!
I always look at rape cases that get to court & have massive sympathy for the victim. To me, if it has made it that far & the victim is still standing, they are telling the truth. You would have to be very unhinged to willingly put yourself through all that shit based on a lie.