Peace be with you.
I am an ex-Muslim, ( future Roman Catholic

),and yes, and there is a law in the Quran that requires at least four witnesses for adultery:
*Sura 24: Ayats 1-17 ( Chapter 24: Verses 1-17 ) :
24:1 A chapter which We have sent down and imposed, and We have sent down in it clear revelations that you may remember.
24:2 The adulteress and the adulterer, you shall lash each of them with one hundred lashes, and do not let any pity overtake you regarding the system of God if you believe in God and the Last Day. And let a group of the believers witness their punishment.
24:3 The adulterer will only marry an adulteress or she who is a polytheist. And the adulteress, she will only be married to an adulterer or he who is a polytheist. And such has been made forbidden for the believers.
24:4 And those who accuse the independent females, then they do not bring forth four witnesses, you shall lash them with eighty lashes, and do not accept their testimony ever; and those are the wicked.
24:5 Except those who repent after this and do good, then God is Forgiving, Merciful.
24:6 And those who accuse their spouses, but they have no witnesses except for themselves, then the testimony of one of them is to be equivalent to that of four witnesses if it is sworn by God that he is being truthful.
24:7 And the fifth shall be the curse of God upon him if he is of the liars.
24:8 And the punishment will be averted from her if she bears witness four times by God that he is of the liars.
24:9 And the fifth shall be the curse of God upon her if he is speaking the truth.
24:10 All this is from the grace of God upon you and His mercy. And God is Forgiving, Wise.
24:11 Those who have brought forth the false accusation were a group from among you. Do not think it is bad for you, for it is good for you. Every person among them will have what he deserves of the sin. And as for he who had the greatest portion of it, he will have a great retribution.
24:12 If only when you heard it the believing males and the believing females should have thought good of their own selves and said: “This is an obvious lie!”
24:13 If only they had brought four witnesses to it. If they did not have the witnesses, then these with God are the liars.
24:14 And had it not been for the grace of God upon you, and His mercy in this world and the Hereafter, a great retribution would have touched you for what you have spoken.
24:15 For you have cast it with your tongues, and you say with your mouths what you have no knowledge of, and you think it is a minor issue, while with God it was great.
24:16 And when you heard it you should have said: “It was not right for us to speak of this. Glory be to You, this is a great lie.”
24:17 God warns you not to repeat something similar to this ever, if you are believers.*
However, some Muslims, especially like Salafis who are extremely conservative have their own ways of equivocating things by manipluation of hadiths and verses. Here is a hadith reportedly from Muhammad:
“Narrated Wa’il ibn Hujr: “When a woman went out in the time of the Prophet (P) for prayer, a man attacked her and overpowered [raped] her. She shouted and he went off, and when a man came by, she said: That [man] did such and such to me. And when a company of the Emigrants came by, she said: That man did such and such to me. They went and seized the man whom they thought had had intercourse with her and brought him to her.
She said: Yes, this is he. Then they brought him to the Apostle of Allah (P).
When he [the Prophet] was about to pass sentence, the man who [actually] had assaulted her stood up and said: Apostle of Allah, I am the man who did it to her.
He [the Prophet] said to her: Go away, for Allah has forgiven you. But he told the man some good words [Abu Dawud said: “meaning the man who was seized”], and of the man who had had intercourse with her, he said: “Stone him to death.“
I do not think the Quran says anywhere, and I’ve read it several times, that four witnesses are needed for accusations of rape. However, often times even Muslims think so and yes you are right, there are some HORRIBLE things that happen when that’s the case. ** However, these things do not happen at the hands of Muslims alone** and all people of all religions and backgrounds should be treated with respect for God made us all. There are many Catholics who will look at Muslims differently and think of them as evil and so on, and I have had such experiences and that’s one reason the Catholic Church strongly pushed me away at first. THEN, when I actually learned what the CC taught, I was amazed ( hence my username

). I decided to become a Roman Catholic, but I still have respect for Muslims even though I do not accept Islam or Muhammad, and if you meet a Muslim do not look at him/her in an inferior manner, but be nice to them so they can see what a true Catholic acts like and that will hopefully increase their interest in the Church and better the impression they have of it.
Anyway, while modesty is being taken to an extreme in some countries like SA, in others it is falling apart, like in the USA and my homeland, Bosnia and Herzegovina. I think this is unfortunate, but hopefully Jesus grants both groups the grace to see their wrongs. May God bless and guide us all.

