diff --git a/trust/src/main.rs b/trust/src/main.rs
index add4f955..02437c13 100644
--- a/trust/src/main.rs
+++ b/trust/src/main.rs
@@ -21,7 +21,7 @@ fn main() {
     for i in parts {
         println!("{:?}", i);
     }
-
+    let mat = matching::Matcher::new();
     let mut up_record = vcf::Record::default();
     reader
         .read_record(&header, &mut up_record)
@@ -29,6 +29,10 @@ fn main() {
     for result in reader.records(&header) {
         let dn_record = result.expect("Unable to parse record");
         // Need to put a sequence resolved guard on seq_similarity
+        if mat.filter_call(&dn_record, false) {
+            println!("filtering {:?}", up_record);
+            continue;
+        }
         println!(
             "size={:?} type={:?} bound={:?} dist={:?} ovl={:?} szsim={:?} gtcmp={:?} pres={:?} filt={:?} sim={:?}",
             comparisons::entry_size(&dn_record),
diff --git a/trust/src/matching.rs b/trust/src/matching.rs
index 30bf75c9..2fc619df 100644
--- a/trust/src/matching.rs
+++ b/trust/src/matching.rs
@@ -1,4 +1,5 @@
 use crate::types::Gt;
+use crate::comparisons;
 use noodles_vcf::{self as vcf};
 use std::cmp::Ordering;
 
@@ -96,12 +97,44 @@ impl Eq for MatchResult {}
 #[derive(Debug)]
 pub struct Matcher {
     pub params: String, // This will be tricky? Maybe...
-    pub fn filter_call(entry: &vcf::Record, base: bool) {
 
-    }
 }
 
-impl Matcher (
+impl Matcher {
+    pub fn new() -> Self {
+        Matcher { params: "Wouldbeparams".to_string() }
+    }
+
+    pub fn filter_call(&self, entry: &vcf::Record, base: bool) -> bool {
+        // self.params.check_monref &  e
+        if entry.alternate_bases().len() == 0 {
+            return true;
+        }
+
+        // self.params.check_multi
+        if entry.alternate_bases().len() > 1 {
+            //panic and exit
+            return true;
+        }
+
+        // self.params.passonly
+        if comparisons::entry_is_filtered(&entry) {
+            return true;
+        }
+
+        let size = comparisons::entry_size(&entry);
+        //self.params.sizemax
+        //self.params.sizemin
+        //self.params.sizefilt
+        if (size > 1209) || (base & (size < 5)) || (!base & (size < 6)) {
+            return true;
+        }
+        //self.params.bSample / self.params.cSample
+        let (samp, prefix) = if base { (0, 'b') } else { (1, 'c') };
+        //if (self.params.no_ref..
+        false
+    }
+}
     //check_monref and alts is None
     //# check_multi and 
 /* TODO
diff --git a/truvari/matching.py b/truvari/matching.py
index 4dc99112..28b323bf 100644
--- a/truvari/matching.py
+++ b/truvari/matching.py
@@ -170,8 +170,7 @@ def filter_call(self, entry, base=False):
            or (not base and size < self.params.sizefilt):
             return True
 
-        samp = self.params.bSample if base else self.params.cSample
-        prefix = 'b' if base else 'c'
+        samp, prefix = (self.params.bSample, 'b') if base else (self.params.cSample, 'c')
         if (self.params.no_ref in ["a", prefix] or self.params.pick == 'ac') \
                 and not truvari.entry_is_present(entry, samp):
             return True