I had a friend who was military and involved in deportations for a while. I remember him saying that all of his crew had been taken into a room and told by one of the top bosses that if any of them were found taking backhanders they would end up in jail and then dismissed. But the reaction was that they needed to be more careful and take the backhanders in a more subtle way. This type of corruption is so embedded it's not easy to get rid of. And there certainly are many many Haitians who are being deported, that's for sure. Clearly there is a percentage that "escapes" after money changes hands, but many others are sent back across the border.
After so many years here, I find the one thing Dominicans love is a bit of bluster. Minister makes a big news announcement, always surrounded by about 30 people who want to get their faces in the photo. Massive crack down on (insert scandal) for two or three weeks, then slowly everyone gets bored and it's back to business as usual. Same with noise. Same with car tax. Trucks on the Malecon. Public schools. Things get slowly slowly better, but dramatic change very rarely sticks.