diff --git a/powershell/ql/lib/semmle/code/powershell/ExpandableStringExpression.qll b/powershell/ql/lib/semmle/code/powershell/ExpandableStringExpression.qll
index c35e406b7c4..fa3a8a77ba2 100644
--- a/powershell/ql/lib/semmle/code/powershell/ExpandableStringExpression.qll
+++ b/powershell/ql/lib/semmle/code/powershell/ExpandableStringExpression.qll
@@ -7,8 +7,6 @@ class ExpandableStringExpr extends @expandable_string_expression, Expr {
 
   StringLiteral getUnexpandedValue() { expandable_string_expression(this, result, _, _) }
 
-  private int getKind() { expandable_string_expression(this, _, result, _) }
-
   int getNumExprs() { result = count(this.getAnExpr()) }
 
   Expr getExpr(int i) { expandable_string_expression_nested_expression(this, i, result) }
diff --git a/powershell/ql/lib/semmle/code/powershell/controlflow/internal/Completion.qll b/powershell/ql/lib/semmle/code/powershell/controlflow/internal/Completion.qll
index d37d566ea0d..9fe03123793 100644
--- a/powershell/ql/lib/semmle/code/powershell/controlflow/internal/Completion.qll
+++ b/powershell/ql/lib/semmle/code/powershell/controlflow/internal/Completion.qll
@@ -96,12 +96,16 @@ abstract class Completion extends TCompletion {
 /** Holds if node `n` has the Boolean constant value `value`. */
 private predicate isBooleanConstant(Ast n, boolean value) {
   mustHaveBooleanCompletion(n) and
-  none() // TODO
+  // TODO
+  exists(value) and
+  none()
 }
 
 private predicate isMatchingConstant(Ast n, boolean value) {
   inMatchingContext(n) and
-  none() // TODO
+  // TODO
+  exists(value) and
+  none()
 }
 
 /**
diff --git a/powershell/ql/src/experimental/CommandInjection.ql b/powershell/ql/src/experimental/CommandInjection.ql
index e32f5aedd71..c7bc85dbcce 100644
--- a/powershell/ql/src/experimental/CommandInjection.ql
+++ b/powershell/ql/src/experimental/CommandInjection.ql
@@ -24,7 +24,7 @@ predicate constantBinaryExpression(BinaryExpr binary) {
 }
 
 predicate onlyConstantExpressions(Expr expr){
-  expr instanceof StringConstExpression or constantBinaryExpression(expr) or constantTernaryExpression(expr)
+  expr instanceof StringConstExpr or constantBinaryExpression(expr) or constantTernaryExpression(expr)
 }
 
 VarAccess getNonConstantVariableAssignment(VarAccess varexpr) {
@@ -39,7 +39,7 @@ VarAccess getNonConstantVariableAssignment(VarAccess varexpr) {
 
 VarAccess getParameterWithVariableScope(VarAccess varexpr) {
   exists(Parameter parameter |
-    result = parameter.getName() and
+    result = parameter.getAnAccess() and
     containsScope(result, varexpr)
   )
 }
@@ -48,16 +48,16 @@ Expr getAllSubExpressions(Expr expr)
 {
   result = expr or
   result = getAllSubExpressions(expr.(ArrayLiteral).getAnElement()) or
-  result = getAllSubExpressions(expr.(ArrayExpr).getStatementBlock().getAStatement().(Pipeline).getAComponent().(CmdExpr).getExpr())
+  result = getAllSubExpressions(expr.(ArrayExpr).getStmtBlock().getAStmt().(Pipeline).getAComponent().(CmdExpr).getExpr())
 }
 
 Expr dangerousCommandElement(Cmd command)
 {
   (
     command.getKind() = 28 or
-    command.getName() = "Invoke-Expression"
+    command.getCommandName() = "Invoke-Expression"
   ) and
-  result = getAllSubExpressions(command.getAnElement())
+  result = getAllSubExpressions(command.getAnArgument())
 }
 
 from Expr commandarg, VarAccess unknownDeclaration