Social services

7 Years ago I had 3 children removed from my care and after the court case they went for adoption. I was on drugs, drinking, no stability, emotional wreck, in a volotile controlling relationship and was a really bad mother and charged with neglect. I am 7 years down the line totally changed my life around and have had another baby with a different partner but the social services are still fighting that I haven't changed enough, this baby would be at risk, I have done assessments of various subjects with different professionals as requested by courts and still this isn't enough for them. I am very heart broken and feel helpless totally and have looked into lie detector testing as they say I am in denail about a few issues from the past and won't believe that I didn't hurt my previous children but they are very costly and have had to come out of my full time employment for contact daily with baby and appointments. I am not on social benefits, do work as an agent which brings me in commision weekly enough to live on until this is over. I just want my baby home and to be given a second chance, I am a lot older and mature to what I used to be and don't drink/do drugs anymore and haven't for a long time. This is distroying not just me but my partner too and our relationship. I don't know what to do anymore, can someone please help!!